Apparently the Sprint version is the super-unlocked (EDIT: Internationally) iPhone. I'd really like to get LTE going on China Unicom. How can I pick one up off-contract in the US? When I am in the US, can I just get some prepaid SIM to use with the phone, or is it really just on Sprint and their 2-year-plans only? In two years, do any of you think that I'll be able to buy an IMEI unlock code or something for this phone? If I can't grab a Sprint phone in the US, does anyone know if the GSM 6+ will work on LTE in China?