The Black update is finally available for the Lumia 920 and 820 on AT&T. This update includes a number of general improvements to the Windows Phone 8 OS and some Lumia exclusive features.
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Nokia's Lumia Black update - which includes Windows Phone 8 Update 3 - is now starting to roll out to the Lumia 625, although some features will not be compatible with the device's lower-end hardware.