The Samsung Galaxy S III for T-Mobile (SGH-T999) will be one of the first devices to receive the Android 4.1 Jelly Bean, But while users wait for Samsung to officially release the update for their devices they can try out a leaked version of Android 4.1.1 which can be flashed onto your device.The leaked ROM seams almost identical to ROM which was leaked for the international Samsung Galaxy S III (GT-i9300) which leads us to wonder if the T-Mobile variant will receiving the update around the same time as the global variant.
While we do not recommend installing custom ROMs, anyone interested in trying out the leaked version of Android Jelly Bean on their T-Mobile Galaxy S III can head over to the source link for details.
source – XDA Developers