Yesterday, Google has started to roll-out the long awaited Android 4.0/Ice Cream Sandwich upgrade to its Google Nexus S devices which so far ran on Android 2.3.6/Gingerbread. The upgrade, which is available for both versions - the North American and the European/rest of the world version - is now distributed as a FOTA (Firmware Over The Air) update and upgrades the Nexus S to Android 4.0.3. At the same time, Google has also started to roll-out a FOTA update for its newest Nexus smartphone, the GSM version of the Samsung Galaxy Nexus, which updates the firmware from Android 4.0.1 to Android 4.0.2 (the Verizon Galaxy Nexus was already released with Android 4.0.2).
While both updates and upgrades are distributed over the air, it can take up to several days or weeks until the device receives its update. However, there are manual update packages available which can be flashed to the device, but unlike over the air updates, these updates will wipe the device's contents and will factory reset them.
Cheers ~ Arne