AT&T iPhone 5 with Straight Talk $45 plan?

I recently bought an AT&T iPhone 5 from a friend. I tried going with MetroPCS, however, it needed to be unlocked.AT&T needed the previous owners information to unlock the phone which i do not have access to (because the friend bought it from someone else). And prices for unlocking an iPhone 5 are through the roof. I heard about the StraightTalk unlimited $45 plan. I don't know all the details just that all i need to buy is the SIM card since the phone is already with AT&T. If you could please tell me the details and whether or not i should get StraightTalk or just get my money back for the iPhone. Please and thank you!

I love Straight Talk i'm using my Verizon iPhone 5 with a AT&T Sim and getting AT&T 3G Speeds but you could get LTE because you have the AT&T model and it should work if you buy the AT&T Sim Just acknowledge you are going to have to buy a sim card cutter because the smallest size striaght talk sells is Micro sim and iPhone 5 requires nano here is a great sim card cutter or if your risky you can try doing it with scissors and print a template out online
http://www.amazon.com/...B00419V4L0

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