I've tried searching around this forum as well as some others and cant seem to find an adequate answer. I just recently purchased an s3 to see if it can compete with my iphone 4s. I have the unlimited iphone data plan through AT&T and would prefer to not lose that seeing as I use around 4/5 gigs of data a month. I switched over the sim card from iphone and everything worked well (text, calls, voicemail) except for data. I have tried everything from turning off the phone to turning off the data. I also tried turning off LTE so it was just running on 3g. Nothing works or recognizes the data plan I have. I wanted to see if any of you guys have any suggestions as I'd prefer to avoid AT&T since they'd switch me off my unlimited plan. If I can't seem to find a reasonable solution other than switching to an outrageous priced 2/3/5 gig data plan, I'll just stick to my iphone. Thanks in advance for the help.