Display and Build
The Microsoft Lumia 640 sports a 5-inch IPS HD multi-touch ClearBlack display with Corning Gorilla Glass 3 protection. It is housed in a nice looking 8.8mm thick outfit which has a weight of 145g and can be held comfortably.
Configuration and OS
Acting as the brains of the smartphone is a 1.2GHz quad-core Cortex A7 processor sitting on Qualcomm Snapdragon 400 chipset. Together with 1GB RAM and Adreno 305 GPU, it guarantees smooth and speedy performance. It ships with latest Windows Phone v8.1 OS with Lumia Denim. There are chances that it may be updated to the latest Windows 10 OS. Moreover, the software giant offers some handy features like 30mins of free Skyping per month, access to Office 365 and 1TB OneDrive storage space, albeit for a limited period.
Camera and Storage
The Microsoft Lumia 640 comes with an 8MP autofocus camera at the back which supports LED flash, geo-tagging, 1/4' sensor size, BSI sensor, 4X digital zoom and continuous shooting and can shoot full HD videos at 30fps. It is accompanied by a 1MP HD camera at the front. It features an internal memory of 8GB which is further expandable up to 128GB.
Battery and Connectivity
The Microsoft Lumia 640 packs a 2,500mAh Li-ion battery which claims to provide up to 26.5 hours of talktime and up to 864 hours of standby time over 2G. Connectivity options include 3G, NFC, tethering, DLNA, OTA sync, Wi-Fi, GPS/A-GPS, Bluetooth v4.0, USB port, GLONASS and computer sync.
The Microsoft Lumia 640 is an excellent Windows powered smartphone in the mid-range group. It overpowers its siblings in all aspects, especially in terms of cameras and comfortable design. It also packs solid configuration and some Microsoft freebies for one year.