hmmm try mo po iroot yung s3 eto yung link How to Root Galaxy S3 I9300 Running on Leaked Android 4.2.1 XXUFMB3 Jelly Bean Official Firmware [Guide] baka need to root yung mobile nyo para magain access po para magkaroon ng 3g.. Sa akin walang problema hinde pa siya rooted pero 3g na dito ko lang...