Nokia Lumia 900 for AT&T receives Windows Phone 7.8 update. Nokia care informed about the update in its Twitter account. The software release for Nokia Lumia 900 is SW 2175.2307.8862.13100.

The update version brings some new features are new start screen experience with resizable tiles to change the size, tap and hold the live tile, Theme colors added, Lock screen improvements, Bing photo of the day as wallpaper, and accidental input protection for the security code.

The Operating system version is 7.10.8862.144, to fix for functionality issues with Live Tiles, such as Live Tiles not updating.  After the update, check out Nokia Collection in Marketplace for new or updated Nokia apps. For more information about the update click here.