The Lumia 640 is not the most powerful smartphones but tend to trust it inspires. The smartphone is pretty, and its rather elegant plastic shell; it also provides access to the battery, it is possible to easily switch in case of failure. As for the screen, it is largely up to what can be expected from a mid range model: with its diagonal of 5 inches (12.7 cm) display and 1280 x 720 pixels, it s’ comfortable and quite light out. Too bad it is not possible to adjust the brightness more accurately than with the proposed three levels (low, medium, high).
The Lumia 640 includes 8GB of memory, but after deducting the space occupied by the operating system and default installed applications, the fact remains that half to the user. It was shortly. Fortunately, it is possible to increase the storage with a micro SD memory card. It is compatible with the 4G mobile networks, a now widespread characteristic. Its processor, the Qualcomm Snapdragon 1.2GHz, refers on the market (high-end smartphones include a model of the same family and even faster). Bluetooth in its version 4.0 allows to connect its various accessories (hands-free car kit, headset, headphone, bracelet, etc.) by reducing energy consumption. Microsoft announced more than 17 hours on 3G communication. These characteristics, there were already incorporated in the Nokia Lumia 635 , Lumia 640 which the successor. Main differences between the two models: the photo sensor increased from 5 MP to 8 MP, RAM is increased to 1 GB instead of 512 MB and the Lumia 640 integrates NFC.
*Dimensions: 14.1 x 7.2 x 0.8 cm
*Weight: 147.9 grams
*Screen 5 inch 1280 x 720 pixels, 294 ppi
*8 GB of total storage, about 4 GB available
*8 MP camera, f / 2.2
*Videos 1080p at 30 frames per second
The Lumia 640 comes with all the usual home applications, such as Internet Explorer (to browse the Internet) or the Windows Store to download applications. Windows Phone now also has its voice assistant to control their smartphone’s voice (the equivalent of Apple’s Siri). The publisher further enhanced with OneDrive (to store files in the cloud), Skype (to pass voice and video calls over the Internet) and especially with its Office suite 365 (Word, Excel, Outlook, Powerpoint). But the user can only benefit for one year: Microsoft offers indeed a temporary license. It will then pay some amount per year to continue using these services, however, will be accessible from several positions (computer, tablet …).