Hello Everyone, Long time listener....First Time Caller. I just upgraded the rid and iphones to 4s. I have a friend who is on T-Mo and would like to purchase one of the 3g's and use it. Can somebody give me some guidence on what needs to be done....never had to unlock as I am on AT&T. What version should I go with...the phones currently have 3.1.3. Can I upgrade him to 4.0 and then jailbreak and unlock? Also, do i just take his sim out of his current t-mo phone and drop it in my iphone? What about a data plan on t-mo? Thanks for any guidence on the best course of action.