Windows 8.1 will be available to all current Windows Phone 8 customers with an update called Lumia Cyan. It features one easy swipe notifications with Live Tiles. It also has faster ways to type with Word Flow, not to mention a new personal voice assistant known as Cortana.
As for the smartphones, the Lumia 635 and 630 have Snapdragon quad-core processors, 4.5 inch Clear Black screen and colorful design with changeable shells. They both have 5 Megapixel rear auto focus camera, and the only difference is that the 630 is available in single and dual-SIM models. The Lumia 930 is considered the new Nokia flagship phone, and it has a Qualcomm Snapdragon 800 quadcore 2.2GHz processor, 2GB RAM, 32GB of onboard storage, and a 5-inch screen with 1,920 x 1080 pixel resolution.