Isnt Verizon CDMA? Though i have seen some mention popping in a SIM card but i assume that is for world phones or something that i obviously dont know about. I havent paid any attention to Verizon. Not interested in them at all.
Verizon is CDMA, as is Sprint. However, if OEM's are able to put the right radio's into the phone and they keep the phone unlocked, it makes no difference what network the phone goes on. Example would be the Nokia Icon. You can buy it on Verizon, but use it on ATT. You are just limited to HSPA+ speeds, as there is no radio for GSM LTE.