Although the iphone 4s is both CDMA/GSM capable you will not be able to activate it with Sprint. We do not have, nor can load the serial number from another carrier into our billing system. In addition, it is most likely locked to ATT.
my Friend is willing to sell me his IPhone 4S pretty cheap. but the problem is that his from ATT. If I buy it will i be able to Use his phone on my Sprint Network?
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