Can I connect an AT&T iPhone 4 to a Metro PCS account?

Okay, I have an iPhone 4 but I'm getting the iPhone 5 and I wanna give my boyfriend this iPhone but he has Metro PCS, I know you have to unlock the phone but will the new metro sim cards work for the at&t phone? Or how can I do it? There has to be a way, http://www.ehow.com/...ropcs.html i can follow these steps, i just need a sim card, and can i just go to metro and buy one?

ATT is has a GSM networkwhile Metro PCS is a CDMA. I do not understand how EHow can foll people like that and nobody questions it.
Only Verison and or Sprint Iphones can work with Metro PCS because they also have a CDMA network. But the phone needs to be unlocked.

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