Hi, So I'm leaving the country for a couple months and there's people that I really want to stay in contact with. I don't want them or myself getting any ridiculous phone bills. If I bring my iPhone, and don't deactivate my service, can I still send imessage for free to other ios5 people IF I'm an AT&T customer, NOT on wifi? I'm jailbroken on 5.1.1 if that matters... Thanks!