It seems like Samsung’s 2012 flagship – Samsung Galaxy S2 is ready for their Android 4.1.2 Jelly Bean update treat from T-Mobile! As usual, this update will be rolled out in several batches so you don’t have to be worry if you’ve not receive the update notification from Samsung. Likewise, you can also go to Applications > Settings > About Device > Software Update > Check for Updates to manually check for the update or simply via Samsung’s KIES software on your PC.
This update will bring new features like the Project Butter, Google Now, Direct Call function and many more onto your Galaxy S2. Nevertheless, do make sure your device is connected to the Wi-Fi before you begin downloading the Jelly Bean update file!
Source : Sam Mobile