The Microsoft Lumia 640[4] and Microsoft Lumia 640 XL[5] are Windows Phone smartphones developed by Microsoft Mobile. Both phones were announced on March 2, 2015,[6] and are the successors to the Nokia Lumia 630 series and the Lumia 1320, respectively. The phones are primarily aimed at developing markets,[7] although they are also available in developed markets as lower-cost options compared to other phones in their classes. The two devices became available in the US and most other markets in June 2015.[8] On February 15, 2016, Microsoft announced the Lumia 650, the Lumia 640 successor, with improvements like device encryption, an AMOLED display, and 16 GB of flash storage.[1]