I've had the Galaxy S3 since last August. Full Monty plan with T Mobile, £33 month for 2000 mins, 2000 texts, free calls to other T M users and unlimited data. It's more than I would ever use.
I love the phone, it's like have a little computer in your pocket with a decent camera and vid. BUT, when I first had it others asked me often if I had any probs re. the phone rebooting it's self or simply turning it's self off. No I didn't..... until now! A month ago it began performing said tricks and last week found it turned off and it was just dead. So, I am now awaiting it's return from T Mobile with some fresh software installed, which apparently is the usual culprit.
Would I have bought this phone had I known...........yep I would, brill phone IMO.