I'm asking because about 6-7 months ago I left Verizon for MetroPCS. I ported 2 lines over & got 2 free iPhone SE's. MetroPCS sucks in my area so now I want to port my 2 lines back to Verizon and bring my 2 iPhone SE's with me if I could. Are these GSM only iPhones? Is there even such thing as GSM only or CDMA only iPhones? If it can be done, do I have to ask MetroPCS to unlocked them first? Any guidance on this matter would be appreciated.