SAMSUNG GALAXY S20 ULTRA 5G SM-G988U 128GB BLACK GRAY GSM+CDMA. IMEI ARE CLEAN AND. WILL WORK RIGHT AWAY WITH SIM. This firmware will automatically changes to carrier logo of your sim. T-Mobile GSM Network such as. AT&T GSM Network such as. VERIZON CDMA Network such as. (The Are they 100% work).