T-Mobile has revealed Android 4.1 Jelly Bean for Galaxy S3. T-Mobile becomes the second US Carrier to give Jelly Bean update to Galaxy S3 (SGH-T999). Here are helping guides to take you out of trouble. T-Mobile Galaxy S3 owners can grab the update via the Samsung Kies software or through an over-the-air update. The software version is 999UVDLJA/JRO03L.
Therea re no clue when other US carriers will provide Android Jelly Bean update to galaxy S3. But we need to wait but some leaks are already on the web. so you can try them out.