If you were to do that I'm pretty sure the 8310 would need to be unlocked, which is easy to do by yourself. Just call up AT&T and have them send you an unlock code in a few days. Other than that obstacle I dont really see why you wouldnt be able to, providing that the prepaid sims from Walmart are removable
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8520(black), 8320(sunset), 8310(red), 8100(black), 8220(black)
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