Iphone 4s switching networks?

I have an Iphone 4s that was previously linked with an AT&T account. My contract is ending soon and I'm wondering if it is possible to deactivate my Iphone from AT&T and get the same Iphone set up with a no-contract plan with Virgin Mobile. Or do I have to buy a new Iphone through Virgin Mobile.

There's NO way! I GUARANTEE IT!

I have Virgin Mobile USA. Virgin Mobile USA is CDMA, that means only Virgin Mobile USA branded phones work on their network. There's NO flashing to or from Virgin Mobile USA.

If you want a Virgin Mobile USA iPhone, you need to buy a Virgin Mobile USA iPhone.
iPhone 4- $349
iPhone 4S - $449.

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