The Microsoft Lumia 640 Dual SIM was announced at 2015, March. Released 2015, April. The Smartphone is released at Discontinued.The Smartphone is released at Discontinued.The Smartphone is Microsoft Windows Phone 8.1, upgradable to Microsoft Windows 10 which consists of Quad-core CPU.The graphics of this device is powered by Adreno 305 GPU.It has 8GB 1GB RAM eMMC 4.5.The device comes in 1 variants: 8GB 1GB RAM eMMC 4.5.The Smartphone comes with Microsoft Windows Phone 8.1, upgradable to Microsoft Windows 10. The Smartphone has 141.3 x 72.2 x 8.8 mm (5.56 x 2.84 x 0.35 in) thickness . It comes in 4 color variants, which are Glossy cyan, Orange, White, Matte black.The Smartphone is 2G Supported and has data speed of HSPA 42.2/5.76 Mbps. It has Dual SIM (Micro-SIM, dual stand-by). Microsoft Lumia 640 Dual SIM has 5.0 inches display with 720 x 1280 pixels resolution. The display is protected by Corning Gorilla Glass 3 ClearBlack display.This device packs Li-Ion 2500 mAh, removable. It has Accelerometer, proximity, compass.