I spent the last hour reading through all the iPhone 5 unlocked threads. There seems to be a difference between a full price iPhone though my contract and a factory unlocked iPhone. My question: If I buy an iPhone5 through my att contract at a full price, will I be able to use this phone oversea with prepaid sim cards? Or will it still be locked to ATT sim cards only ? If so what would be my option? Will the IMEI unlock from ebay last forever? or is it possible that the iPhone 5 will lock itself after I restore it or with time passing by? thank you so much in advance for any help!