How to get iMessage and Facetime to work without jailbreaking?

I just bought a Unlocked Apple iPhone 4 from the Apple store. It's now running on AT&T GO Prepaid Network. It has no 3G service since it's running on AT&T's prepaid network. How can I get it to work?

IMessage and Facetime should work without 3G. Both those apps work using WI-FI.

They should work right out of the box… You can use it on Wi-Fi.

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