Update details:
- Version: Android version 4.1.2/ Baseband version T989UVMC6
- Kies only update (~756MB MB)
- New Features: Android 4.1.2 OS (Jelly Bean)
The update should also bring improved notifications, offline voice-typing, better power management, Project Butter improvements and more to Galaxy S II.
“Beginning April 8, the Samsung Galaxy S II will have an optional software update to Android version 4.1.2/ Software T989UVMC6 via Samsung Kies only. This update changes the OS to Jelly Bean,” T-Mobile noted on the software update page.
Planning to update your Galaxy S2, you can download Kies from here, you can find more details on the update page, which is linked in the last para.

One reply on “Samsung Galaxy S2 gets Jelly Bean update on T-Mobile USA”
Really Amazing when will 9100G get 4.1.2 update? every version of S2 have got the Update