Lumia Cyan update availability: http://www.nokia.com/global/support/software-update/wp8-software-update/
For supported devices:
- > Choose your region
- > Browse to your Country
- > Find your device and mobile operator
- > Review current status for the Cyan update
Example for Lumia 520 in the UK:
If Lumia Cyan is "Available".
Make sure you have at least 1.5GB of free space. You can check by App List > Settings > Storage Check.
To perform the OTA update. App List > Settings > Phone Update.
Compatible Lumia devices:
Nokia Lumia 520, 520T, 521, 525, 526, 620, 625, 630, 630 Dual SIM, 635, 720, 720T, 810, 820, 822, 920, 920T, 925, 925T, 928, 930, Icon, 1020, 1320 and 1520.