Greetings Alan, thank you for taking the opportunity to ask us your question about the Samsung Galaxy S25 Ultra. The advertised unlocked Galaxy S25 Ultra is the U.S. version of this device. It is compatible with the following U.S. wireless carriers: AT&T, Boost Mobile, Cricket, Google Fi, H2O Wireless, Mint Mobile, Sprint, T-Mobile, Ultra Mobile, US Cellular, Verizon, and Visible. This device works well with 2G GSM - GSM850, GSM900, DCS1800, PCS1900; 3G UMTS - B1(2100), B2(1900), B4(AWS), B5(850), B8(900); 4G FDD LTE - B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B12(700), B13(700), B14(700), B18(800), B19(800), B20(800), B25(1900), B26(850), B28(700), B29(700), B30(2300), B66(AWS-3), B71(600); 4G TDD LTE - B38(2600), B39(1900), B40(2300), B41(2500), B48(3600); 5G FDD Sub6 - N1(2100), N2(1900), N5(850), N7(2600), N25(1900), N28(700), N66(AWS-3), N71(600); 5G TDD Sub6 - N41(2500), N77(3700), N78(3500); 5G TDD mmWave - N257(28GHz), N258(26GHz), N260(39GHz), N261(28GHz). Feel free to contact Support if you have additional questions for us. Thank you for choosing Samsung! - Debra