Do you need to unlock/jailbreak your i Phone to get go phone/t mobile prepaid on it?

Sebastian

New member
I'm getting an i phone soon and i'm buying a full price one on eBay because i don't want a contact phone with monthly bills, i just want to pay what ever amount of minutes i want on it like prepaid, and i hear you can buy a go-phone 3g sim card and activate the sim card, pop it into the phone, and buy a minutes card. but my question is will i have to jail break? is it illegal? will it screw up my phone?
 
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