The Nokia Lumia 630 is a smartphone developed by Microsoft Mobile that runs Microsoft's Windows Phone 8.1 operating system. It was announced on 2 April 2014, at Microsoft Build 2014 and scheduled to be released in July 2014. It has a Qualcomm Snapdragon 400 SoC with a quad-core processor and Adreno 305 GPU. Additionally, it has a 4.5-inch display and a 5 MP camera. The Lumia 635 is similar but 4G-compatible, lacks a dual-SIM version and comes in a different finish, while the Lumia 636 and 638 are identical, but come with 1 GB of RAM and are currently available only in China and India respectively.

The Microsoft Lumia 640 and Microsoft Lumia 640 XL are Windows Phone smartphones developed by Microsoft Mobile. Both phones were announced on March 2, 2015, and are the successors to the Nokia Lumia 630 series and the Lumia 1320, respectively. The phones are primarily aimed at developing markets, 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.