So my friend just sold me his AT&T iPhone 4, but I only have T-Mobile so I guess the only option I have is to use Gevey Sim, but I have some questions... - Is Gevey Sim Ultra the best choice for T-Mobile? - Where is a reliable place I can buy Gevey SIM from? - The iPhone has firmware 4.3.5 installed.. can I jailbreak it and preserve the baseband? (My baseband is 4.10.01) Should I even care about preserving the baseband? I'm only asking because I wonder if in the future an unlock might be released that only works with 4.10.01 and not newer ones. - can I upgrade to the latest firmware 5.0.1 without upgrading or modifying the baseband? Do I have to do that "SHSH blob save" thing? - Will I be able to activate the phone with Gevey Sim? I'm just afraid that once I do that iTunes will ask me to "Activate" it but I have no account with AT&T. Can someone please enlighten me? I've already read many guides but those are some questions I haven't seen a definite answer for. I appreciate your help.