I have an unlocked AT&T iPhone 5, can I use it on the verizon network?

Verizon iPhone 5's do have SIM cards, but I saw where the networks are different something about a gsm and a CDMA network. I want to be able to use it on verizon

Verizon only uses SIM cards for 4G LTE service. Their network is still CDMA and you can't bring a non-Verizon phone onto their network, plus the CDMA side of the iPhone 5 is non-functioning on AT&T phones.

NO, AT&T phones are GSM, and not compatible with Verizon, which is CDMA.

AT&T iPhone 5 won't work on Verizon for incompatibility. Period.

No they are not on compatible networks