Hi all, I currently live in Bangkok and so have an old unlocked 2G iPhone (the very first one). However, I'm coming to the U.S. this fall for just 4 months and want to be on the AT&T network (for the unlimited data plan). Can I 're-lock' my iPhone and activate it legitimately by signing up for a contractless AT&T plan? I don't want to jailbreak/unlock it so that I don't have to keep restoring for firmware upgrades. Also, AT&T's "data plan network" refers to both EDGE and 3G right? So my original iPhone will work on EDGE right? Thanks for any help.