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Microsoft lumia memory card. Problems in reading the Windows Phone SD card

Often, one built-in memory is not enough. Installing an external flash drive in a special slot of the device helps to expand it. The so-called SD cards store a lot of important and unique information: photos, audio files, video clips, applications, notes, and more. And if for some reason the drive fails and Windows phone does not see the SD card, this can become a serious problem in using a smartphone.

The source of this failure can be various kinds of technical problems. However, the problem can be fixed. To do this, there are several effective methods.

Causes of Flash Drive Read Error

The message that SD card not found on Windows Phone may occur quite unexpectedly. Even if there were no such problems before and the flash drive worked properly in the device. If this error occurs, the first thing to do is to make sure that the memory card used in the device is made by a reliable manufacturer. Otherwise, it is likely that the flash drive simply failed and cannot be restored.

Along with this, a reading error can be caused by a number of other reasons that can be corrected:

- discrepancy between the format of the used card and those supported by devices on Windows platform phone;
- full memory;
- data protection with a password;
- software failure.

For each reason, there is a solution. The most difficult to diagnose is a software failure that will require a complete formatting of the flash drive.

What is format matching?

If you encounter an error while connecting a flash drive windows phone sd card error, it is worth checking how it meets the requirements.

The flash drive must be in Micro SD format. This information is indicated on the packaging and on the product itself. In addition, its volume should correspond to what is possible for a particular operating system:

- for the platform Windows Background 8.1 and 10 versions are allowed from 4 to 200 GB;
- for software The 8th version can use a flash drive with a capacity of 4 to 128 GB.

If the specified parameters match, but SD problem Windows card phone it remains to check whether access to it is blocked by a password.

How to find out if there is an active password on a flash drive

To understand whether the information on the SD card is protected, you need to connect it to a computer. This can be done using a special card reader, or an adapter.

Next, you need to go to the "My Computer" section and find in the list removable media your flash drive. If, when you try to open it, the PC asks for confirmation of access rights and the information is not available, you must remove set password. This can only be done on the device on which access protection has been installed.

In the case when access is open, and the card meets the required parameters, there are two ways to solve the error that has occurred in the operation of the flash drive: scanning it, followed by troubleshooting and formatting.

Scan for SD card problems

This procedure will also require a connection to a computer. Before doing this, the flash drive must be safely removed from the mobile device. To do this, go to the section system settings. In it, select the section responsible for the memory of the device. Find the SD card item in the list. Long press to open the context menu and select the "Delete" option from the list that opens.

For the Windows Background 8 platform, the path to the flash drive lies through the settings section, which is responsible for applications. Here you can select the "Memory control" item, in which the USB flash drive will be presented. context menu you will need to click on the "Eject card" item.

After the flash drive is removed, you need to connect it to the computer. If the option to scan and fix problems is automatically offered, you need to select it. Or go to the "My Computer" section and click on the appropriate option in the context menu of the flash card.

In the case where a lot of data is stored on the card, the procedure for identifying problems and correcting them may take a long time. After its completion, you need to install the card on your mobile device and restart your phone.

Formatting a flash drive

The ultimate troubleshooting method is to completely wipe the memory card. Before doing this, you need to save a backup copy of the stored data. Otherwise, they will be lost forever.

Formatting is also carried out using a PC. This item can be selected from the context menu of the SD card. In the window that opens, you need to set the necessary parameters:

- for drives with a memory capacity of 4 to 32 GB, you must select file system"FAT32" and cell size 32 Kb;
- for a flash drive with a memory capacity of 64 to 200 GB - "exFAT" and a size of 128 KB.

The formatting procedure may take a long time. Upon completion, the card must be removed from the PC using safe removal. Recover from backup files need only formats compatible with the device. These are JPEG for images and photos, MP4 for videos, and MP3 for audio files.

The range of MicroSD memory cards that you can install in your Lumia smartphones is very wide. At the time of buying microSD cards you should pay attention to two things: the actual amount of storage and the class. Not all microSDs offer same speed data records, and the higher the class, the better results you can achieve. For example, for Class 10, an impressive 10 MB per second is the minimum performance. In this article we will understand what are the differences between the cards.

The MicroSD card is good because it is one of the smallest options for removable flash memory. Designed specifically for mobile devices The card is about the size of a fingernail. You can store your documents, photos, videos, music, games and even some applications on it.

Gamers and Photographers: Class 10

If you have, say, a Lumia 830, take a lot of photos, and even use the “raw” DNG format, and don’t take your finger off the shutter at all, you need a memory card with the highest data write speed so that the device has time to save images.

If you love games with great graphics like Asphalt 8: Airborne or Halo: Spartan Strike, having a high-speed card ensures that your gaming experience is not marred by stuttering.

Instagram fans: Class 4 and Class 6

If you're into Instagram, share your #Lumialove all the time, and record HD video on your Lumia 730 or Lumia 1520, 4th or 6th grade is fine. The higher, the better, of course.

Common use: Class 2

Do you take up most of your memory with documents and music? Second-class cards will be the most attractive solution both in terms of features and price.

If you're not ready to spend the extra money on storage expansion at all, and you still need the extra space, take advantage of the OneDrive cloud storage that's already on your Lumia. Up to 30 GB is available for free, and with the purchase of the Lumia 640 and Lumia 640 XL, you'll also get an annual subscription to Office 365 Personal, which includes a full terabyte of cloud space.

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The range of "Windows-backgrounds" was replenished with the following models. Four variants of the Lumia 640: single-SIM and 3G networks, single-SIM and LTE networks, with two slots for SIM-cards and support for 3G networks, with two slots and LTE. Also, the public were presented with four variants of the Lumia 640 XL with a similar combination of distinctive features. The younger model Lumia 640 is equipped with a 5″ screen, the Lumia 640 XL has a slightly larger screen - 5.7″. Considering that all smartphones will be sold at the same time, and the single and dual SIM options will have the same price, the question involuntarily arises: what, in fact, were Microsoft marketers thinking? The lineup Lumia is already crowded with devices, and you can figure out how one of them differs from the other only if you get a grasp of the lists of characteristics and compare them line by line. The release of four pairs of smartphones with the same price and the difference only in the number of slots for SIM-cards does not make the process of choosing a mobile companion any easier. Why even launch identical smartphones with support for one or two SIM-card slots with the same price tags? After all, it is clear that other things being equal, buyers will prefer models with support for two SIM-cards.

Be that as it may, at the time of writing the review on the Microsoft website, there was information only about four variants of the smartphone: 640 LTE, 640 DS LTE, 640 DS 3G and 640 XL DS 3G. Further in the text of the review, the abbreviation "DS" means support for two SIM-cards. For all variants of the smartphone, several body colors are available: white, black, red and blue. Some of them were in stock, others were only available by pre-order.

SoC Qualcomm Snapdragon 400 became the basis for devices of the Lumia 640 family, all smartphones are equipped with 1 GB of RAM and 8 GB of flash memory. The display type is the same for all models (the diagonal is different), but the main cameras of the 640 and 640 XL are different: 8 MP and 13 MP matrices, f/2.2 and f/2.0 optics, respectively. The front cameras are also different: the Lumia 640 XL has a 5 MP wide-angle Full HD camera and the Lumia 640 has a 0.9 MP HD camera. Naturally, the larger 640 XL has a more powerful battery: 3000 mAh versus 2500 mAh. And one more difference: models with LTE support are also equipped with NFC module.

The hero of this review was a smartphone in the Lumia 640 DS 3G variant.

Characteristics of Microsoft Lumia 640 smartphones

SoC Qualcomm Snapdragon 400 MSM8926, 1.2 GHz, 4 cores ARM Cortex-A7
GPU Adreno 305
Operating system Microsoft Windows Phone 8.1 Update 2 Lumia Denim Pack
Touch display 5″, IPS, ClearBlack, 1280×720, capacitive, multi-touch, Corning Gorilla Glass 3
RAM 1 GB
Inner memory 8 GB
Model Nokia Lumia 640 3G: 2G GSM (850, 900, 1800, 1900MHz), 3G WCDMA (850, 900, 1900, 2100MHz) communications
Nokia Lumia 640 LTE model: 2G GSM (850, 900, 1800, 1900 MHz), 3G WCDMA (850, 900, 1700, 1900, 2100 MHz), 4G/LTE (bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28)
Broadcast GPRS data, EDGE, HSPA+ (up to 42 Mbps), LTE (up to 150 Mbps)
Wi-Fi 802.11b/g/n, Bluetooth 4.0, NFC
GPS/Glonass/BeiDou, accelerometer, magnetometer (compass), gyroscope, proximity sensor, light sensor
FM radio
Cameras: main 8 MP (autofocus, flash), additional 0.9 MP
Removable 2500 mAh battery
Dimensions 141.3×72.2×8.8mm
Weight 145 g

For comparison, the table shows the characteristics of several latest models Nokia in the version with support for LTE.

	Microsoft Lumia 640	Nokia Lumia 735	Nokia Lumia 830	Nokia Lumia 930	Nokia Lumia 1520
Screen	5" IPS	4.7" AMOLED	5" IPS	5" AMOLED	6" IPS
Permission	1280×720, 294 ppi	1280×720, 312 ppi	1280×720, 294 ppi	1920×1080, 441ppi	1920×1080, 367 ppi
SoC	Qualcomm Snapdragon 400 MSM8926 @1.2GHz (4 ARM Cortex-A7 cores)			Qualcomm Snapdragon 800 @2.2GHz (4x Krait 400 cores)
GPU	Adreno 305			Adreno 330
RAM	1 GB	1 GB	1 GB	2 GB	2 GB
Flash memory	8 GB	8 GB	16 GB	32 GB	32 GB
Memory card support	there is	there is	there is	No	there is
Operating system*	Windows Phone 8.1				Windows Phone 8
SIM format**	Micro SIM	Nano SIM
Communications		2G/3G/4G, Wi-Fi 802.11b/g/n, Bluetooth, NFC	2G/3G/4G, Wi-Fi 802.11a/b/g/n, Bluetooth, NFC		2G/3G/4G, Wi-Fi 802.11a/b/g/n/ac, Bluetooth, NFC
Battery	removable, 2500 mAh	removable, 2220 mAh	removable, 2200 mAh	non-removable, 2420 mAh	non-removable, 3400 mAh
cameras	rear (8 MP; video 1080p), front (0.9 MP)	rear (6.7 MP; video 1080p), front (5 MP)	rear (10 MP; video 1080p), front (0.9 MP)		rear (20(5) MP; 1080p video), front (1.2 MP)
Dimensions and weight	141×72×8.8mm, 145g	135×69×8.9mm, 134g	139×71×8.5mm, 150g	137×71×9.8mm, 167g	163×86×10.6mm, 209g
Average price***	T-12206544	T-11030519	T-11030194	T-10771306	T-10548283
Nokia Lumia 640 DS LTE Retail Deals	L-12206544-10

* OS version is indicated at the time the device was released on the market
** The most common SIM card formats are described in a separate article
*** average cost at the time of reading the article

Equipment

The smartphone comes in traditional packaging for the current generation of Lumia devices. The design is assembled from two boxes, the inner part is placed in the outer cover. There is little information about the parameters of the smartphone on the packaging, all of it is presented in the form of a few icons. Some details about the characteristics specific model smartphone can be recognized from the text and abbreviations from the sticker glued to the package.

The mobile computer that had been in the editorial office included only Charger and documentation. According to information from the Microsoft website, Lumia 640 buyers will receive just such a modest set of accessories.

Appearance and usability

There are several typical skins for Lumia smartphones. The first group includes strict rectangular (in plan) devices with chopped sharp edges. Devices of the second group also differ in faces that intersect strictly at an angle of 90 degrees, but their body is made of plastic, not metal. Finally, the third extensive group includes models with rounded, smoothed hull contours and smoothly transitioning edges. Most representatives of the third category are also made of plastic. Obviously, cutting and turning metal at a right angle is still easier than giving it a rounded or curved shape.

It is to the third category of Lumia smartphones that the current hero of the review belongs. Smooth lines of the body and colored plastic give the Lumia 640 a somewhat frivolous look, but this is a long-standing trend of Nokia/Microsoft designers. They love cheerful and cheerful tones in their devices, and we can only praise them for this. For lovers of strict style, there is a black and white back panel.

At first glance, the Lumia 640 makes a good impression, but the devil, as you know, is in the details. And the longer you work with a smartphone, the more, unfortunately, you find such disappointing moments.

The main, main, almost ultimatum drawback of the Lumia 640 design is extremely slippery plastic. Perhaps the current hero of the review is the most “unstoppable” in the bad sense of the word smartphone from those that have been in my hands. The lacquered back and sides of the Lumia 640 turn the smartphone into a bar of soap. Nothing helps - neither a sufficiently large width of the edges, nor a significant surface area of the rear panel; smartphone still every now and then strives to slip out of the hands. It is out of the question to use the device in transport, and even more so to do something there with one hand: one extra push and the Lumia 640 will go from the palm of your hand towards the center of the Earth. What made Microsoft designers choose such material for the case of the hero of the review can be understood, but what allowed the engineers to agree with them is difficult. Most Lumies use a much less slippery soft-touch plastic that feels like rubber to the touch. However, judging by the appearance of the recently announced Lumia 435, slippery plastic is a long-term trend in the work of Microsoft developers. It is sad. Well, to finally close the issue of the plastic back panel of the Lumia 640, I note that, as it should be for a varnished surface, it perfectly collects fingerprints, traces of touches and scratches.

Given the above, it would be possible not to dwell on how the smartphone lies in the palm of your hand. But if we ignore the lacquer plastic or imagine that the owner of a mobile computer has rough skin or the surface of a smartphone is covered with a layer of dirt, then the following should be noted: in terms of dimensions, the Lumia 640 fits perfectly into a medium-sized palm. The smartphone has to be held tightly, and the fingers have something to catch on - the wide side edges help. When working with a smartphone, the power button is located just under the thumb of the right hand. The relatively light weight of the mobile computer does not cause discomfort or fatigue.

It is difficult to control the Lumia 640 with one hand, but with a strong desire it is possible. The main obstacle in this is not a large display, but, as already mentioned, slippery plastic. In the pocket of trousers and shirts, a mobile computer fits without problems.

There are no complaints about the quality of materials and assembly of Lumia 640. Plastic does not look cheap, does not crunch or creak, the back panel of the smartphone does not bend, there are no backlashes of parts and extraneous sounds during shaking.

Let's move on to the next unpleasant feature of the Lumia 640's appearance and design - a wide gap for a phone speaker. When the smartphone was in the editorial office, a certain amount of dust had already accumulated in this deep container. Over time, there will be even more of it, if you do not pay due attention to its cleaning. But the speaker hole isn't the only dust and dirt collector on the front of the Lumia 640.

The same depth, but much smaller hole is provided for the microphone, which is located at the bottom of the screen. It will be really difficult to clean anything out of it. This “deep” list ends with a gap between protective glass display and its plastic rim.

The entire front panel of the Lumia 640 is Corning Gorilla Glass 3. Beneath it are the display, lens front camera, light and proximity sensors. The Lumia 640 does not have dedicated touch buttons for controlling the system, they have been replaced by virtual counterparts.

The back panel of the smartphone covers its entire body, "overlapping" going to all the side faces. This design of a mobile computer is also called a "boat". The design is strong, but it can be very inconvenient if you need to gain access to the battery compartment. Lumia 640 is one such case. In order to more or less quickly disconnect back panel, you have to put quite a lot of pressure on the lens of the main camera, holding the smartphone by the upper edge of the case. No notches for nails or other aids are provided. We just press on the lens, the body is squeezed out, a millimeter of plastic appears, we cling to it with a fingernail and separate the two parts further. It is clear that this is far from the most reliable solution, and only the rarity of the operation itself to replace the battery, SIM card or memory card during normal use of the smartphone helps to alleviate the fate of the camera glass.

The back panel of the Lumia 640 is installed without any problems. Replacement of the memory card and SIM cards is possible only when the battery. If one of the Micro-SIM cards gets stuck, it can be pushed with a fingernail or other handy tool through a special hole in the case. Judging by the fact that notches and holes for pushing SIM cards began to appear in almost every new smartphone, their jamming in the connectors is quite common.

Holes are provided for the camera lens, LED flash, main speaker and connectors on the back of the smartphone. There are repeaters for the keys. On the inside of the lid, there are three rubber dampers and a black sticker instead of an NFC antenna, which this Lumia 640 does not have.

Plastic keys located on the right side of the Lumia 640 case control the volume and power of the mobile computer. Strangely, Microsoft engineers did not provide the traditional button for controlling the camera in the Lumia 640. The shape of the keys is flat, the dimensions are sufficient for comfortable blind control of the smartphone. Additional convenience is created by a large key travel and a distinct click when pressed.

The left side of the Lumia 640 is left blank. At the top of the smartphone is a headphone hole. At the bottom is a lone Micro-USB-compatible connector for the sync and charge cable.

So, the appearance and design of the Lumia 640 left mixed impressions. With a general traditional design and execution, the current hero of the review has many minor and one major drawback in terms of exterior. Let's be honest: using a smartphone is inconvenient, it is very slippery. Lumia 640 should be immediately hidden in a case or the back panel should be replaced, for example, with a cover with a front shutter and a card holder.

Screen

The Lumia 640 screen parameters are as follows: IPS matrix, resolution 1280 × 720 pixels (HD), diagonal 5″, dot density - 293 dpi. The picture on the screen of the review hero is clear and colorful, individual pixels are invisible.

The display of the smartphone is protected from damage by Corning Gorilla Glass 3. The brightness of the backlight is adjusted manually and automatically.

The Lumia 640's capacitive sensor reliably recognizes up to four simultaneous signals. If there are five or more signals, it begins to confuse them, the signals begin to disappear, and the sensor's behavior becomes inadequate.

Detailed examination using measuring instruments conducted the editor of the sections "Monitors" and "Projectors and TV" Alexey Kudryavtsev.

The front surface of the screen is made in the form of a glass plate with a mirror-smooth surface, resistant to scratches. Judging by the reflection of objects, the anti-glare properties of the screen are no worse than those of the Google Nexus 7 (2013) screen (hereinafter simply Nexus 7). For clarity, here is a photo in which a white surface is reflected in the off screens (on the left - Nexus 7, on the right - Microsoft Lumia 640, then they can be distinguished by size):

The screen on the Microsoft Lumia 640 is a bit darker (brightness in photos is 97 versus 111 on the Nexus 7). Tripling of reflected objects on the Microsoft Lumia 640 screen is very weak, which indicates that there is no air gap between the outer glass (it is also a touch sensor) and the matrix surface (OGS type screen - One Glass Solution). Due to the smaller number of borders (glass/air type) with very different refractive indices, such screens look better with strong external illumination, but their repair in case of cracked external glass is much more expensive, since the entire screen has to be changed. On the outer surface of the screen there is a special oleophobic (grease-repellent) coating (very effective, better than the Nexus 7), so fingerprints are removed much easier, and appear at a slower rate than in the case of ordinary glass.

When displaying a white field in full screen and with manual brightness control, its maximum value was 385 cd/m², the minimum was 3.4 cd/m². The maximum value is quite high, and, given the excellent anti-reflective properties, in bright daylight The image on the screen must be clearly visible. In complete darkness, the brightness can be lowered to a comfortable level. With brightness control, everything is quite complicated. Firstly, on a separate page, the user can select one of three profiles with fixed brightness levels and turn on the mode with automatic brightness adjustment according to the ambient light level (the sensor is located to the right of the front camera eye).

Secondly, on another separate page (toward the end of the list of applications and settings), you can go to the next level page and there, for manual mode, adjust the brightness levels for these three profiles.

And for the automatic mode on this page, the degree of sensitivity is configured:

Further, for the automatic mode (in which, when external lighting conditions change, the screen brightness both increases and decreases), for three conditions, we will give the screen brightness values \u200b\u200bfor three positions of the sensitivity slider (at a minimum, by default and at a maximum). In total darkness in automatic mode brightness is reduced to 3.2, 12 and 25 cd/m² respectively (the first value is too low, the other two provide acceptable reading comfort in total darkness); in an artificially lit office environment (approximately 400 lux), the brightness is set to 80, 250 and 385 cd/m² (the first two values can be considered appropriate), in a brightly lit environment (corresponding to lighting on a clear day outdoors, but without direct sunlight - 20000 lux or slightly more) - rises to 385 cd / m² in any case (the maximum, which is expected). As a result, this function works more or less adequately and allows the user to make adjustments to its work. Note that there is an option in the settings, the inclusion of which supposedly improves readability in bright light. It is not clear what this setting actually changes, since when it is activated, the backlight brightness does not change, and visually nothing changes on the screen either - even in bright external light, even in the dark. At any brightness level, there is no significant backlight modulation, so there is no screen flicker.

AT this smartphone IPS type matrix is used. Micrographs show a typical IPS subpixel structure:

For comparison, you can see the gallery of microphotographs of screens used in mobile technology.

The screen has good viewing angles without significant color shift even at large deviations of the gaze from the perpendicular to the screen and without inverting shades. For comparison, here is a photograph in which the same images are displayed on the Nexus 7 and Microsoft Lumia 640 screens, while the screen brightness is initially set to about 200 cd / m² (on a white field in full screen), and the color balance on the camera is forcibly switched to 6500 K Perpendicular to the plane of the screens is a white field:

Note the good uniformity of brightness and color tone of the white field. And a test picture:

The color reproduction is good and the colors are saturated on both screens, the color balance differs insignificantly. Now at an angle of about 45 degrees to the plane and to the side of the screen:

It can be seen that the colors have not changed much on both screens, but on the Microsoft Lumia 640, the contrast has decreased to a greater extent due to strong black highlights. And the white box:

The brightness at an angle for both screens has noticeably decreased (at least 5 times, based on the difference in shutter speed), but in the case of Microsoft Lumia 640, the brightness drop is slightly larger (brightness in photos is 227 versus 230 for Nexus 7). The black field, when deviated diagonally, is highlighted strongly and acquires a yellowish tint or remains approximately neutral gray. The photos below demonstrate this (the brightness of the white areas in the direction perpendicular to the plane of the screens is the same for the screens!):

And from another angle:

When viewed perpendicularly, the uniformity of the black field is good:

Contrast (approximately in the center of the screen) is normal - about 750:1. The response time for the black-white-black transition is 23 ms (13 ms on + 10 ms off). The transition between 25% and 75% grayscale (according to the numerical value of the color) and back takes a total of 37 ms. The gamma curve constructed from 32 points with equal intervals over the numerical value of the gray tint did not reveal a blockage either in the highlights or in the shadows, and the exponent of the approximating power function turned out to be 2.14, which is close to the standard value of 2.2, while the real gamma the curve deviates slightly from the power dependence:

Color gamut close to sRGB:

The spectra show that the matrix filters moderately mix the components to each other:

As a result, visually the colors have a natural saturation. The balance of shades on the gray scale is good, since the color temperature is not much higher than the standard 6500 K, and the deviation from the black body spectrum (ΔE) is less than 10, which is considered an acceptable indicator for a consumer device. At the same time, the color temperature and ΔE change little from shade to shade - this has a positive effect on the visual assessment of color balance. (The darkest areas of the gray scale can be ignored, since the color balance does not matter much there, and the measurement error of color characteristics at low brightness is large.)

By going to the second (far) page with screen settings and selecting the next nesting level - page Color profile - the user can choose one of the preset profiles or a profile in which the color reproduction can be adjusted with the sliders for color temperature, hue and saturation.

The last slider slightly changes the color gamut. Pregnant Bright we get:

Pregnant natural we get:

Profile cold- increased color temperature. Profile standard described above visually and by measurements. Profile bright- increased color saturation. Go to profile additionally. Note that fine tuning using the calibrator is significantly complicated by the lack of a numerical indication of the current values and the ability to choose your own image to display at the top of the screen or even just a large area of the white field on this page. The numerical result of the correction carried out is shown in the graphs above with the caption Corr. There are some improvements, but not fundamental. You can stop at the default profile standard.

Let's summarize. The screen has a sufficiently high maximum brightness and has excellent anti-glare properties, so the device can be used outdoors without problems even on a sunny summer day. In complete darkness, the brightness can be lowered to a comfortable level. It is permissible to use the mode with automatic brightness adjustment, which works adequately. The advantages of the screen include an effective oleophobic coating, the absence of flicker and air gap in the layers of the screen, as well as the sRGB color gamut and good color balance. Significant disadvantages are the low stability of black to the deviation of the gaze from the perpendicular to the plane of the screen. However, in general, the screen quality is high.

Sound

Smartphone Microsoft Lumia 640 is equipped with two speakers and one microphone. The phone speaker, which is located at the top of the front panel of the mobile computer, has a high volume and good sound quality. Even with strong external noise, the interlocutor's voice will be clearly distinguishable.

The main speaker of the Lumia 640 is located at the bottom of the rear panel of the smartphone. Its volume is also high, but the sound quality is average. At maximum power and with an abundance of low frequencies, it begins to wheeze noticeably.

There is only one hole for the main speaker back cover smartphone, and even a small diameter. As a result, the speaker is very easy to muffle if you close this hole with something. The volume of the sound becomes almost zero, only vibrations continue to pass through the body of the smartphone.

The Lumia 640 did not come with a standard headset, so the quality of the smartphone's headphone output was tested in conjunction with wired ones. Sony headphones MDR-XB30ER. Subjectively, the sound quality was excellent. Even at the maximum comfortable volume, there were no distortions. It was not possible to reach the maximum possible level of sound power - it became scary for hearing. Thus, with good headphones, the Lumia 640 is quite suitable for listening to music in any conditions.

The sound volume in the smartphone is changed both programmatically and using two keys on the left side of the device case. To play music in the memory of a mobile computer, a regular Xbox Music audio player and the MixRadio program are installed - a streaming radio service client with the ability to paid subscription for unlimited listening to audio compositions.

Connected to the Lumia 640, the headphones act as an antenna for the smartphone's built-in FM radio. It doesn't work without headphones. The program for managing the receiver has a standard appearance. It can automatically search for stations, favorite stations can be collected in a list or placed on the desktop in the form of tiles. RDS technology and audio output to the main speaker of the smartphone are supported.

Camera

As already noted, the Lumia 640 and Lumia 640 XL smartphones are equipped with different cameras. In the test mobile computer models with 8 megapixel and 0.9 megapixel sensors were installed for the main and additional cameras, respectively. The physical size of the main camera sensor is 1/4 inch. The aperture value of the optical system of the camera is f/2.2, the focal length is 28 mm. The camera is equipped with an autofocus system. An LED flash can be used for shooting in poor lighting conditions. Video is recorded at 1080p resolution.

F-number of the optical system additional camera equals f/2.4. There is no auto focus system. Video recording is carried out with a resolution of 720p.

Too bad the Lumia 640 doesn't have a traditional camera button. Perhaps the manufacturer makes it clear that for photo experiments it is better to look at another smartphone model.

Shooting is controlled by the Lumia Camera app. There are no serious delays when activating the camera, the application starts in just over a second.

In addition to the Lumia Camera app in Memory Lumia 640 has several other photography-related programs: Lumia Stories, Lumia Moments, Lumia Photos Come to Life, Lumia Selfie, and Lumia Photo Studio.

	The quality of the front camera is quite consistent with 1 megapixel.
	Good field and plan sharpness. It's nice that the trees practically do not merge.
	Branches and even grass are well worked out. Long-range sharpness is good.
	In low light, the camera performs quite well.
	Good field and plan sharpness. Not all 13-megapixel cameras are able to work out grass even in the foreground in the same way.
	The camera copes with macro photography.
	The text is well done.

Perhaps, the camera has no obvious shortcomings, except for the low resolution of the matrix. But she works out her 8 megapixels in full. However, we have already seen all this in previous non-top smartphones of the Lumia line: a good module and enough clean work programs. Even though the module is different here, best qualities he inherited his predecessors. And this is not surprising: why try to change what was already done well. The camera successfully combines good optics, a decent sensor and a reasonable moderate program. And more accurate words than "just good camera, to describe it is difficult to pick up. It is quite suitable for artistic and documentary shooting.

Software

Smartphone Microsoft Lumia 640 running operating system Microsoft systems Windows Phone 8.1 Update 2 with Lumia Denim Pack. In the future, all devices in this series should receive a firmware update based on the upcoming Windows 10 operating system.

Traditionally for Microsoft/Nokia devices, the Lumia 640 comes preinstalled with a large number of additional software. The list includes Microsoft applications: Office, OneNote, OneDrive, Skype. Together with a smartphone, the user receives 15 GB of space in the cloud. OneDrive storage to store any data and another 15 GB for photo backup. Also, when buying a smartphone, a free subscription to Office 365 services for a period of one year is provided.

On-site navigation and mapping services: Here Drive+ and Here Maps. For some reason, the Here Transit application was absent in the memory of the hero of the review, but it can be easily installed from the Microsoft application store.

For those who like to take pictures of themselves, others and the surrounding reality, smartphone developers have provided as many as five different applications.

Lumia 640 did not bypass domestic specifics: instead of the Cortana assistant, when you click on a special button, Yandex search is called up, in addition to the Facebook client, the VKontakte social network application is present in the smartphone’s memory, reading lovers can use the client of the virtual bookstore LitRes: Read!

Telephone part and communications

All variants of Lumia 640 smartphones are capable of working in 2G and 3G networks. The following frequencies for GSM networks are supported: 850, 900, 1800, 1900 MHz. For WCDMA networks: 850, 900, 1900, 2100 MHz. The maximum data download speed in the 3G network is 42.2 Mbps.

Smartphones supporting LTE networks additionally work with the 1700 MHz WCDMA band. LTE support includes the following frequency bands: LTE FDD B1, B2, B3, B4, B5, B7, B8, B12, B17, B28, TD-LTE B38, B40. In LTE Cat 4 networks, the maximum download speed is 150 Mbps.

Smartphones with two SIM card slots work according to the Dual Standby scheme: both communication channels are active in standby mode, the second channel is turned off in phone call mode, and the smartphone is “out of reach”. Only one SIM card can work in fast 3G/4G networks, the second channel is always connected to the 2G network. You can switch between the two channels for data, messages and phone calls without powering off your smartphone.

Tests of the Lumia 640 instance that was tested showed reliable operation of the cellular communication module. The 3G network was defined both in Moscow and in the Moscow region. The data transfer rate in the WCDMA network turned out to be significantly lower than the declared maximum theoretical, but this is normal for busy cellular networks in the metropolitan area.

The Bluetooth 4.0 module in the Lumia 640 has a large number of work profiles. In conjunction with the Sony MW1 wireless stereo headset, two of them were tested: A2DP and HSP. Support has been on highest level: play music with track titles broadcast, answer phone calls with the transfer of not only the phone number, but also the name of the interlocutor from the contact list of the mobile computer.

In home conditions WiFi networks with a TP-Link TL-WR1043ND router as an access point, the smartphone demonstrated a data exchange rate of 40 Mbps.

Lumia 640 models with LTE support are also equipped with NFC. The smartphone that was in the editorial office with support only for 3G networks was deprived of it.

But all variants of the Lumia 640 interact with systems in the same way. satellite navigation. The smartphone receiver receives a signal from GPS satellites, Glonass and BeiDou. A-GPS technology helps to find the signal of satellites and determine the approximate location of the smartphone based on data from base stations cellular and Wi-Fi networks.

Performance

The basis for the entire Lumia 640 family of smartphones was the well-known Qualcomm Snapdragon 400 platform, which is used in countless devices. There is no exact data on which chip modification is installed here - most likely, it is MSM8926. The platform includes four computing cores ARM Cortex-A7 with a maximum frequency of 1.2 GHz, and GPU Adreno 305. The chip is manufactured using the 28 nm process technology.

RAM in all modifications of the Lumia 640 is set to 1 GB, flash memory - 8 GB. Of which 3.3 GB is occupied operating system and preinstalled apps. Additional space for music, photos and videos can be obtained using a card microSD memory, cards up to 128 GB are supported. Support external USB drives Lumia 640 does not.

Introduced almost two years ago, the Qualcomm Snapdragon 400 SoC was originally intended for the mid-range smartphone segment. In the time that has passed since the premiere, its performance and capabilities have been well studied, there is no need to wait for any revelations here. Unfortunately, in all respects it is inferior to modern SoCs even at a budget level, but, as the Lumia 640 example shows, its capabilities are enough for new devices even in 2015. In fact, most of the current line of Nokia/Microsoft Lumia devices use this platform in its various variations.

Let's see what marks the hero of this review received in performance tests.

	Microsoft Lumia 640	Nokia Lumia 735	Nokia Lumia 830	Nokia Lumia 930	Nokia Lumia 1520
	4×1.2 GHz Adreno 305 5″ 1280×720 2500 mAh	4×1.2 GHz Adreno 305 4.7″ 1280x720 2200 mAh	4×1.2 GHz Adreno 305 5″ 1280×720 2200 mAh	4×2.2 GHz Adreno 330 5″ 1920×1080 2420 mAh	4×2.2 GHz Adreno 330 6″ 1920x1080 3400 mAh
AnTuTu (points, more is better)	11719	11917	12001	25036	25473
MultiBench 2 CPU (points, more is better)	16,121	15,838	16,072	31,492	29,749
MultiBench 2 Graphics (points, more is better)	44,674	45,958	46,539	47,636	48,766
phonemark (points, more is better)	900	806	816	1946	1774

There is nothing new in the test results, we still have the same well-known platform.

The GFXBench graphics benchmark results table shows two values for each of the tests. This is due to the fact that in onscreen mode the application generates an image with a resolution of 720p, and in offscreen mode - 1080p.