Hi guys I lost my phone 4s today. It was stolen at LaGuardia Airport. It was there one minute and the next minute it was gone. On find my iPhone it was moving so I erased it. Erase took. So I'm going to Cherry Hill New Jersey and there's an Apple Store there. So I ordered one and it's available for pick up tomorrow. But question is I'm on the road I don't have any way to to sync it to my computer cause I don't have my Mac air, so Will I be able to use it immediately by just activating it through iCloud.? Does AT&T have to be involved?