Does anyone know if I buy iPhone 3GS

[Christian 5G]

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I was wondering that if Im gonna buy iPhone 3GS do I have to do contract? Or I can buy like just iPhone without contract? Help

 

[S.B.G]

Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

I was wondering that if Im gonna buy iPhone 3GS do I have to do contract? Or I can buy like just iPhone without contract? Help

If you buy it from Apple or AT&T you will have to do another contract.