i have an iphone (not the 3g) as well as i have it upon go phone as well as i wish to put it upon an att devise instead of prepaid..is which probable but carrying to buy the brand new sim card?

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• convert gophone to postpaid

Related solution post:

1. Can I use my SIM card from my GoPhone in another ATT phone?
2. can i buy an iphone from att without a contract and use the sim card from my att prepaid phone?
3. We are on an att plan and our phone broke. Can we put the Sim card in a go phone and use our plan’s minutes?
4. att go phone sim locked to phone, i want it in my iphone 3g?
5. if i get a gophone $10 off of att store online, can i use the sim card to put in my new phone ?