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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  • BabelHuber - Friday, June 12, 2015 - link

    It depends on the software you use - nobody forces you to use the software the phone shipped with. For teh SGS4, I prefer AOSP-based ROMs or GPE-versions.
  • Margalus - Thursday, June 11, 2015 - link

    oh, and I am not ms propaganda. The phone wasn't bloated. Brand new out of the store with no apps it wouldn't last more than a day. The person at the store even told me that I would have to charge it every day. I also bought a replacement battery to use since it died so fast, that replacement battery works exactly the same as the stock battery. Barely 24 hours.
  • BabelHuber - Friday, June 12, 2015 - link

    You claimed your WP-phone lasts 5-8 times longer than your Android phone, didn't you? Perhaps this was slightly exagerated?

    But be it as it may, when I have battery problems I actually tend to install a tool to analyze things. Then I can deinstall or freeze the app which causes the problem or block its wakelocks. Problem solved.

    Some other people may prefer to whine because of their low battery runtime instead, to each its own.
  • leexgx - Friday, June 12, 2015 - link

    most avg for battery life is a Nearly a working day for most smartphones (8-12 hours)

    (if you turn off mobile data 3 days is easy maybe even 5 if you can get your phone to use 2G only) and Most people do not AOSP ROM there phone
  • we - Thursday, June 11, 2015 - link

    Two things I cannot confirm (using a fully updated HTC 8X). 1. Action center always flows smoothly. Never had any stuttering or freezing. 2. Generally Scrolling speed is proportional to swipe speed. I can scroll from top to bottom of the "Windows Phone" page of this review within 5 seconds if I swipe quickly, or 15 seconds if I swipe slowly. Top scrolling speed could be faster though.
  • Zizy - Thursday, June 11, 2015 - link

    Currently using lowly HTC 8s which was the worst WP8 phone till 435, no issues with action center - no delay or freeze. It has somewhat strange/unexpected opening, because it can be fully opened or just enough to play with those 4 buttons and or go in settings. I never had enough unattended notifications to be able to test scrolling there.

    Camera - This isn't a proper camera with viewfinder or at least tiltable display. Ever tried underexposing something under bright sun? You wouldn't be able to see anything on the screen. But it would be good to have some notification to tell how many stops below the preview the image is going to end. If you are serious enough about manual stuff this should be enough to know how will the image turn out :)

    As for idle battery drain - try activating battery saver and see the power draw then, plus check which apps drain the battery. If it is the same, probably screen, something failed to close / is intentionally running in the background or some other hardware/software bug. Shouldn't happen but does. Manually closing apps usually resolves the problem.
    If battery saver does help, play with sync settings for mail and similar. For me, syncing mails as they arrive instead of manually every now and then drops battery life from 3-4 days to 1-2 (light use - no demanding games). If you get tons of mail it will be even worse.
  • Harry_Wild - Monday, June 15, 2015 - link

    I just purchased an international version of the 735 and I love it for $300. It is unlocked. I purchased a cyan battery cover too. It feels like a iPhone 6 with a case on it! Same thinnest! The 400 is slow in some operations; but overall it pretty good overall. I switch to the iPhone 6 and back from day to day since they use the same nano SIMs card inside. My iPhone cost $900 so performance is quite a bit faster on everything. But still I like the change of environments. The WP does not have all the apps that I use so most case I pin the webpage and create an icon tile as a substitute. It works for a lot of Apple apps except for Apple Pay and Starbuck's Pay.
  • SirPerro - Monday, June 15, 2015 - link

    I'm just amazed at how people can deny the reality in front of them.

    This phone has a better camera/screen than a Moto E and it is MUCH worse in every other regard. The app selection and quality of the apps is orders of magnitude worse. The web browsing experience is laughable. The overal OS experience and fluidity is worse, no matter how much iOS/WP fanboys keep repeting stupidities about android performance.

    The only reason Windows Phone is alive is because Microsoft has a HUGE pile of cash they can burn if they want to stay in the game, and I seriously pity everybody who puts they hard earned money in such a shitty and undeveloped ecosystem.

    Even with the screen and camera, I find no single person in the planet to which I'd reccomend this phone over a Moto E. And while I'm probably much less polite, the bottom line of the review is Brandon & Anandtech agree with that.
  • Zizy - Tuesday, June 16, 2015 - link

    Quick check whether you need Android/iOS ecosystem:
    Need an app not on WP? Don't get WP.
    Really want anything social (games or apps)? Don't get WP.
    Completely tied to Google/Apple? Don't get WP. Note that plenty think they are tied to google but only really need their search, mail and youtube and could easily ditch the rest.

    Not found yourself up there? You will bitch about WP... but you will bitch about Android and iOS as well :)


    Want better hardware? Go with Lumia. Software? Moto E.
    Would I buy Lumia 640 though? Heck no. I have a WP dev phone already, don't need another. As a primary phone, this one still has too poor camera for my wishes. Lumia 830 is much more tempting, but costs quite a bit more.
  • BaronMatrix - Monday, June 15, 2015 - link

    MS is so pissing me off... First they destroy how I use my desktop, now since they bought Nokia NOT ONE NEW PHONE HAS COME OUT...

    You can't get the 640 anywhere... T-Mobile has it coming soon for MONTHS... And no 640XL even mentioned... Even the MS Store doesn't mention the 640...

    I'm through with Windows Phone... I'll keep one for DEV, but I'm getting an Android phone... I'd rather be able to get all the cool apps that don't come on Windows Phone...

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