I have a factory unlocked iPhone 4S and I am moving back to the US in a few days. I previously was with AT&T but now I would like to get a data plan without entering a 2-year contact. Simply because I'm not sure if I will stay in the US for more than 2 years. I could probably order a prepaid phone and then jailbreak my iPhone to use data, but I'd prefer a "legally correct" solution. What are my current "official" choices? Are there any at all? Any provider is fine with me. Thank you!