Can u use an at&t sim card with a verizon wireless phone?

nope.. att is called a gsm network and verizon is a cdma.. in simple terms att uses sim cards and verizons is esentially encoded in the phone.. so there is no way you can take it out.. but verizon just completed their first 4g call not too long ago.. and good news, verizon is using sim cards as their 4g network.. so you MIGHT be able to do that eventually.. i dont know if unlocking it will work though.. i have heard rumors that you still wont be able to do that after the transition.. sorry :(
 
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