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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  • Wolfpup - Tuesday, June 9, 2015 - link

    Out of curiosity, what's slow about the 521? It's main limitation is RAM I think, but then that mostly just means it has to load a bit more when switching programs.

    Of the mobile OSes right now I like iOS best (though obviously I like real Windows far, far better), but I pad $950 for my iPhone and when it broke replaced it with a Lumia 635, and...honestly it's nearly as good, for my use at least. The podcast program actually syncs with iTunes too, and there's nothing on Android that does that for real. (I've seen things CLAIM to, but they don't actually.)
  • mockyboy - Tuesday, June 9, 2015 - link

    Once I upgraded to Windows Phone 8.1, it became noticeably slower. Apps crashing, phone freezing, getting the resuming message for 20 seconds or so. And I don't have that much loaded on it.
  • testbug00 - Tuesday, June 9, 2015 - link

    oh, in that case, a 640 should be fine. The issue you're running into is most likely RAM.
  • testbug00 - Tuesday, June 9, 2015 - link

    Unless you're set on Windows Phone, going with a Moto X 2013 ( is probably the best option.
    Or, if you want/need SD card, get the newest Moto G. Make sure one of the ones with SD card slot, if Moto is still segmenting that.

    From WindowsPhoneLand, there isn't anything that technically has a faster SoC that isn't $300+ iirc. At least, not now.

    If you don't mind buying used, I would check out, everything I've got off there has been great so far. hope it still is.
  • Harry_Wild - Thursday, June 18, 2015 - link

    I have an iPhone 6 and it is super fast and has tons of high quality apps too! I use currently the iPhone 6 and Lumia 735. Both are 4.7". I would recommend the iPhone 6 if you can afford it! But the Lumia 735 is pretty nice at the now low price of $200. I purchase it at $300.
  • jjj - Tuesday, June 9, 2015 - link

    It's weird how Metro makes the phones look bulky and crowded, the childish icy iOS rainbows are quite the opposite. Not that M$ should copy that, just the message.
    They also need to dump this kind of back shell. Nokia, iphone 5c, Xiaomi Redmi and many others turned this kind of shell into the definition of cheap and the way they implement it makes the phones bulkier too.
    As for this device ,too bad for the SoC , guess for a startup like Microsoft it's normal to not have the resources to make it's software run on A53.
  • StormyParis - Tuesday, June 9, 2015 - link

    that kind of back shell does make an additional case 'which 75% of smartphone users add) unnecessary. I think the Nokia should be compared to case-equipped iPhone et al, and then the bulk issue goes the other way. I'm not a Nokia customer, but I'd love to have a similar design on my Androids.
  • Callum S - Tuesday, June 9, 2015 - link

    Completely agree here. It's always been a massive benefit. They're normally thinner than even the most expensive phones with a case, that makes them feel cheap and fat anyway, or much better value and safer than using an alternative phone without one.

    Additionally, as someone who has very rarely used phone cases, I have always found phones with easily replaceable cases beneficial for both appearance when I have dropped and damage them (no walking around with cracked phone cases or backs like so many people with iPhones) and for when I want to pass them down to other family members. After a fresh install and a new $15 back shell it's essentially like a new phone for those who aren't too concerned.
  • damianrobertjones - Tuesday, June 9, 2015 - link

    Not bad at all really especially for people that don't care or ever need something faster.
  • GlobeGadget - Tuesday, June 9, 2015 - link

    My first smartphone was Nokia Lumia 800, it was a pretty great phone but it wasn't as great as the 3310 when it met the pavement... :(

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