These are incompatible with each other, which means that you can't unlock
a CDMA phone purchased on Verizon and take it to AT&T's GSM network, or vice versa.
Check iPhone imei apple for warranty, network, sim lock, carrier, model, unlock price, find my iphone, iCloud status, serial number,
purchase country A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and
CDMA mobile
phones by mobile
phone
Most unlocked
phones not
purchased through the carriers themselves tend to work with AT&T and T - Mobile, but some are «multiband» capable, which means they work with
CDMA providers such as Sprint and Verizon.