The group that was once Nokia's mobile division has gone through a great number of changes in the past few years. After declining sales of Symbian devices, the company decided to go all in with Microsoft's Windows Phone platform. In a very short time, Nokia became the number one vendor of Windows Phone smartphones in the world. Despite this, the move to Windows Phone failed to revitalize the company. In August of last year, Microsoft purchased Nokia's mobile devices business in a 7.2 billion dollar acquisition. Less than a month later, Microsoft launched the Nokia Lumia 830, and the Nokia Lumia 735. These were the last two Lumia smartphones that would be branded as Nokia devices. With Nokia's phone division absorbed into Microsoft, future Lumia devices would fall under the Microsoft brand.

Today's review focuses on the Microsoft Lumia 640. This phone was announced alongside the Lumia 640 XL at MWC in February, and it's one of the first new Lumia devices released under the Microsoft brand. At $129, the Lumia 640 occupies a fairly low price point as far as smartphones are concerned, and it serves as an entry model to the Lumia smartphone line. To give a quick idea of what that $129 gets you in terms of hardware, I've organized the Lumia 640's specifications in the chart below.

Microsoft Lumia 640
SoC Qualcomm Snapdragon 400
4x ARM Cortex A7 at 1.2 GHz
Adreno 305 at 450 MHz
Memory and Storage 1GB LPDDR3 RAM, 8GB NAND + MicroSDXC
Display 5.0" 1280x720 IPS LCD
Cellular Connectivity 2G / 3G / 4G LTE (Qualcomm MDM9x25 UE Category 4 LTE)
Dimensions 141.3 x 72.2 x 8.8 mm, 145g
Cameras 8MP Rear Facing w/ 1.12 µm pixels, 1/4" CMOS size, F/2.2, 28mm (35mm effective)

0.9MP Front Facing, F/2.4, 30mm (35mm effective)
Battery 2500 mAh (9.5Wh)
Other Connectivity 802.11b/g/n + BT 4.0, GNSS, DLNA
Operating System Windows Phone 8.1 + Lumia Denim
Price $129 on Cricket Wireless

The Lumia 640's hardware is certainly above average in some areas. The first thing I noticed is that it ships with a 5" 1280x720 IPS display. This puts it significantly ahead of devices at the same price point which typically ship with qHD panels. 1280x720 devices show up closer to the $200 price bracket, and so the Lumia 640 is definitely ahead in this regard. The 1/4" 8MP camera is another spec that you wouldn't expect to see on a smartphone priced at around $100. While the camera sensor is hardly the only factor when it comes to final image quality, Lumia devices have traditionally had very good image processing, and so the Lumia 640's camera capabilities may end up far beyond those of the competition.

All the other specifications are fairly typical for a phone of this price. 8GB of NAND, 1GB of RAM, and 2.4GHz 802.11n WiFi are all you get at this price. There is one thing that disappoints me, and that's the SoC. Snapdragon 400 is fairly old by this point, and has been replaced by Snapdragon 410 for some time now. While the Moto E review showed that Snapdragon 410 isn't an enormous leap over Snapdragon 400, it certainly helps, and I wish Microsoft had used the Lumia 640 as an opportunity to start shipping ARMv8 devices.


When the Lumia brand was originally introduced there were only two devices available. The first was the Lumia 710, and the second was the Lumia 800. I had always felt that the Lumia 710 was a fairly standard looking smartphone, but Lumia 800 had a unique type of industrial design. That design has since expanded with the introduction of models at different price points, and some of the physical characteristics that can be seen in the Lumia 640 are not the same as those in other Lumia devices like the Lumia 735.

In a change from the order I typically follow when discussing the design of phones, the first part of the Lumia 640 I want to examine is actually the back cover. It’s a very solid feeling blue glossy plastic shell, although I would much prefer a matte finish, as the glossy plastic on this cover is already covered in scratches and smudges. The back cover has the Microsoft logo in the middle and in the case of this review unit a Cricket Wireless logo on the bottom. Next to the Cricket logo is a small hole to allow sound to pass through from the speaker underneath. Above the Microsoft logo is the 8MP rear-facing camera, and to the left of that is the LED flash.

What I find notable about this back cover is that although it’s removable, it feels incredibly solid and holds onto the phone very tightly. To put things in perspective, I actually questioned whether or not the back cover was removable when I first received the phone. Because there was no visible SIM slot I had to go online and confirm to myself that Cricket Wireless is not a Verizon or Sprint sub-brand running on EvDO and that there had to be a SIM slot somewhere. Only after I did this was I confident enough to pry off the back cover from the top of the phone.

The left side of the Lumia 640 is completely bare, while the right side has both the power button and the volume rocker. I was actually surprised at how good the buttons felt. The last two phones I reviewed were the Moto E and the ZenFone 2, and they also had removable frames or shells with some of their buttons attached to them. Compared to them, the buttons on the Lumia 640 have a much nicer tactile response, and a longer travel distance.

One key difference between the Lumia 640 and some of Microsoft’s other Lumia devices is that it has flat sides and rounded corners. This contrasts with the traditional appearance of Lumia devices, which are flat on the top and bottom, but rounded on the left and right sides. The shape of those edges also meant that there was no way to have rounded corners even though the corners of the black face plate were rounded, which I felt created a unique appearance that made Lumia devices more distinct. The more standard flat edges and rounded corners of the Lumia 640 just aren’t as unique, and I wish it was more like a traditional Lumia phone.

The top of the Lumia 640 has the 3.5mm audio jack, and the microUSB port is on the bottom. Something I noticed about my unit is that the actual port didn't line up perfectly with the hole that was cut in the plastic back shell of the phone. The hole was shifted slightly to the right, and the offset was just far enough to ensure that I could never get my charging cable to go in without jiggling the connector around until it found its way into the port. I assume that this is just a production mishap that is specific to my unit, but it's enough to cause a moment of frustration when trying to charge the phone or transfer files to it from a computer.

There’s not a whole lot to see on the front of the Lumia 640. It’s dominated by the 5” display, with only a handful of things positioned on the bezels around it. You may notice that you can see the touch array when light shines on the phone in a certain way. This is common on many phones, but it's a bit more noticable on the Lumia 640 than other devices. The bezel at the bottom of the display has a microphone to be used during calls, while the top has the front-facing camera and the earpiece speaker. Microsoft has seen fit to also put their logo on the top bezel, just in case you missed the logo right in the middle of the back cover.

My overall impression of the Lumia 640’s build quality and design is positive. While I’m not a fan of the glossy finish, the overall construction feels much more solid than any other phone at this price point that I’ve used.

System Performance
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  • GlynG - Thursday, June 11, 2015 - link

    Agreed. I've recently got a 640, my first windows phone, and the scroll speed is slow. Why can't they have an option to adjust it as the user wishes? First thing I do on getting a new computer is to adjust the scroll stopped to max and I'd do the same here if I could.
  • Margalus - Thursday, June 11, 2015 - link

    this scroll speed issue is not an issue with windows phone, it's an issue with the specific phone. My HTC One M8 scrolls just as fast as android, or as slow. Depending on you swipe or flick.
  • Michael Bay - Tuesday, June 9, 2015 - link

    I wish more WP phones had sensorcore thing. My 730`s pedometer is really quite handy.
  • cheshirster - Thursday, July 30, 2015 - link

    640 has it
    630 too
  • BMNify - Tuesday, June 9, 2015 - link

    The Matte Black Lumia 640 looks and feels much better.
  • MrSpadge - Tuesday, June 9, 2015 - link

    About the camera app: Brandon, if you change either ISO or shutter speed the software is adjusting the other one to get you a picture as good as it can. If you want to over- or underexpose the image, there's a separate setting for that.

    Honestly I don't know why anyone short of a professional photographer with a huge DSLR in a special situation would want to set ISO and shutter speed manually and try endless times to get just the right exposure. A live preview of the real captured image would help with that, but on a mobile screen outdoors that preview may not be very representative of how it looks like on a normal computer screen anyway.
  • Brandon Chester - Tuesday, June 9, 2015 - link

    If you adjust both the preview doesn't change. The manual mode is poorly designed.
  • MrSpadge - Wednesday, June 10, 2015 - link

    I know, that's what you said in the article. However, my point was that one should use the exposure adjustment, optionally together with either ISO or shutter speed. This takes better care of pretty much anything you could want from manually changing ISO and shutter speed. Except for images which are pretty much only black or only white.. but those could be better produced with Photoshop than a camera.
  • tanyet - Wednesday, June 10, 2015 - link

    Hardly. The manual mode is one of the best things about Lumia's and get copied often. You're not really seeing a good representation of the image until you get it on a pc anyway.
  • bman212121 - Saturday, June 13, 2015 - link

    Actually it's a PEBKAC issue. The manual mode is identical to that of an SLR. There is no "preview" in view finder because it's not really possible to preview what adjustments the shutter speed has on an image in real time. Using 100 iso with 1/20 of a shutter speed vs 800 iso with 1/160 shutter will give the same exposure but provide much different images especially if you have a moving subject. I suspect all you are looking for is a way to tell if the exposure is correct or not. On an SLR there is usually a grid in the bottom of the OVF with +- 3 stops and a little arrow that will tell you if you are over or under exposed. This is represented by the EV (labeled brightness) number in the upper right corner. As MrSpadge said you can simply look at that number and use it to determine the correct exposure which is most cases it should read 0. That should be a much more precise value than trying to eyeball the brightness from a pseudo preview on screen.

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