Can I buy a iPhone 4 with a 2 year contract but change to prepaid after 1st bill??

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@macmoney wrote:
I just ordered the iPhone 4 from AT&T with a two year contract...I really didn't want a contract but to get iPhone you had to choose the plans...I was wondering if there was a way to change plan or go prepaid after first month bill???

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You can change to any post-paid plan at any time but to change to pre-paid, you would have to pay the ETF.