Microsoft Lumia 640 LTE Dual SIM official Pictures. Microsoft Lumia 640 LTE Dual SIM is a Smartphone of microsoft. The Microsoft Lumia 640 LTE Dual SIM Windows Mobile Smartphone. Announced Mar 2015. Features 5.0″ Display, Snapdragon 400 Chipset, 8 MP Primary Camera, 1 MP Front Camera, 2500 MAh Battery, 8 GB Storage, 1000 MB RAM, Corning Gorilla Glass 3. Microsoft Lumia 640 LTE Dual SIM price starts.