T-Mobile has started rolling out the Android 4.0 Ice Cream Sandwich update for its Galaxy S II variant in the United States. The carrier had promised a few weeks ago that it will start rolling out the update beginning from 14th July, and has managed to keep it words.
The Ice Cream Sandwich update for the T-Mobile Galaxy S II brings with it many new features and enhancements, bug fixes and none of the visual goodness introduced by Google in stock Android 4.0. Below is the full change-log of the update -:

• Android 4.0 Ice Cream Sandwich
• CMAS Improvement
• Wi-Fi Calling Enhancements
• Voicemail Enhancements

Other features introduced by this update include Face Unlock, slightly refreshed UI elements, better performance and stability, a new browser with support for bookmark sync and more.
T-Mobile Galaxy S II owners can update their handset only by using Samsung KIES software, as the update is not being rolled out via OTA. Users also need to make sure that they are running on Android 2.3.6 (TKID/KL1/LDE) update with at least 50% of battery life before proceeding to update their phone to Ice Cream Sandwich.