Can I take an AT&T iPhone 4 and switch to Virgin Mobile?

My cousin gave me his iPhone 4 which is through AT&T and I was wondering if I could take the SIM card out and switch it to Virgin Mobile because I don't want to pay $300.00 for an unlocked iPhone.

No, Virgin runs on Sprint's network which isn't compatible with your phone. You can activate it with H20 Wireless. You can get the SIMs at BestBuy. You still need to have the phone unlocked.

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