how to use old att Iphone 3g on verizon? or prepaid sim car?

[dianaml]

Hi I gave an old att iphone 3g to a friend, her service is Verizon so obviously she can't just swap her sim card. Is there another way have this work?

I appreciate any help!
Diana

 

[Alli]

There is no way to use an AT&T (GSM) iPhone 3G on Verizon (CDMA).