Okay, I have a iPhone 3G on 4.01 and have been using a AT&T prepaid SIM. But after figuring out how much it's cost me over a month ($60 on their $3 per day that I use it, which means I probably should have taken the $60 unlimited plan anyway), I think T-Mobile would be a better choice. They have a $50 unlimited talk/text plan for their prepaid card. I haven't been using data (to save money and because I could never get data to work on the prepaid sim), so only having edge data isn't an issue. I know I can jailbreak 4.0.1 and then unlock to use t-Mobile. Anyone using this setup and confirm that it will work? Can I can transfer my AT&T prepaid number to t-mobile so I don't have to tell everyone a new number? If I want to, can edge data work in this setup? Thanks.