For those wondering what is Lumia 1020 US CV, Microsoft has started offering Lumia 1020 unlocked sometime back.
Lumia Cyan brings goodies from both Windows Phone 8.1 and Lumia Cyan Firmware in one. You may like to read some of earlier posts for any help required and for getting tips and tutorials for Windows Phone 8.1 and Lumia Cyan.
[Just updated to Windows Phone 8.1 (Lumia Cyan)? Here is your guide to Nirvana!!]
For catching everything about Lumia Cyan and Windows Phone 8.1 which includes:- Full Changelog, Hands-on demo videos, Tips, Tutorial no better place than our dedicated Lumia Cyan and Windows Phone 8.1 page.