First off I don't know much. What I want is a AT&T I5 (or 4S) that I can put a Straight Talk micro sim card into and have unlimited everything for $45 a month. I see them new/almost new and unlocked for $350 ish. How can I check if they work if they aren't currently activated? Is it true that if it's already an AT&T phone that unlocking isn't necessary if the contract is over? But the owner has to call and unlock it? If I buy a phone with a current contract can I have it unlocked? I guess I need someone trustworthy to deal with. Anybody know someone?