The Microsoft Lumia 640 Dual Sim with a 5.0 inch touchscreen display with a resolution of 720 pixels by 1280 pixels at a PPI of 294 pixels per inch.Powered by 1.2Ghz Quad-core Qualcomm Snapdragon 400 processor and it comes with 1GB of RAM. The phone packs 8GB of internal storage that can be expanded up to 256GB via a microSD card. As far as the cameras are concerned,the phone packs a 8-megapixel primary camera on the rear and a 1-megapixel front shooter for selfies.The Microsoft Lumia 640 Dual Sim runs Windows 8.1 Mobile and is powered by a 2500mAh removable battery. It measures 141.30 x 72.20 x 8.80 (height x width x thickness) and weigh 145.00 grams.Connectivity options include Wi-Fi, GPS, Bluetooth, NFC, FM, 3G and 4G. Sensors on the phone include Proximity sensor, Accelerometer and Ambient light sensor.