If I buy a AT&T iphone, can I use Verizon or Sprint's SIM card?
I knew AT&T is GSM network, Verizon and Sprint are CDMA network, so AT&T 's iphone can't use Verizon's SIM card?
Added (1). Some people may say verizon is CDMA, it does not need SIM card, but you know the Iphone 4s for Verizon has SIM card slot, so it is for what? Or if I buy iphone 4s can I use all kind of (Verizon, AT&T, Sprint and T-Mobile)SIM cards?
Lol.
I have Google.
I bet I can get the answer.
Yup. Same link told me why it has a SIM card and whether it will work on AT&T.
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