Microsoft Lumia 640 Dual SIM specifications
5-inch (1280 x 720 pixels) HD display ClearBlack IPS display with Corning Gorilla Glass 3 protection
1.2 GHz quad-core Qualcomm Snapdragon 400 processor with Adreno 305 GPU
1GB RAM, 8GB internal memory, up to 128GB expandable memory with microSD
Windows Phone 8.1 OS with Lumia Denim, upgradable to Windows 10 for Phones
Dual SIM
8MP auto focus rear camera with LED flash
1MP front-facing camera
3.5mm audio jack, FM Radio
3G, WiFi 802.11 b/g/n, Bluetooth 4.0, GPS / aGPS
2500 mAh battery
Microsoft Lumia 640 XL Dual SIM specifications
5.7-inch (1280 x 720 pixels) HD ClearBlack IPS display with Corning Gorilla Glass 3 protection
1.2 GHz quad-core Qualcomm Snapdragon 400 processor with Adreno 305 GPU
1GB RAM, 8GB internal memory, up to 128GB expandable memory with microSD
Windows Phone 8.1 OS with Lumia Denim, upgradable to Windows 10 for Phones
Dual SIM
13MP auto focus rear camera with LED flash
5MP front-facing camera
3.5mm audio jack, FM Radio
3G, WiFi 802.11 b/g/n, Bluetooth 4.0, GPS
3000 mAh battery
Both Lumia 640 and 640 will available through Flipkart