So I am going to be getting an iPhone 3G soon to replace my stolen Touch and I have a few questions... -I am on ATT. Can I just insert my SIM card into the iPhone and continue using my "standard" plan or do I need a data plan to use the iPhone?(I plan on using WiFi for internet, email, etc...) -If I do need a data plan, can I just jailbreak and then unlock so I don't need a data plan? -The person I am getting the iPhone from said it's on 3.1 firmware. Which would be the best and easiest way of jailbreaking? Edit: Apparently he already has it jailbroken and unlocked(he's using T-Mobile on it). Since it's already JB'd and unlocked, does that mean I can use it on ATT without a data plan? If I think of any more questions, I'll let you know. Thanks!