Hello AnnSam, thank you for asking us your question about the Samsung Galaxy S24 Ultra. The advertised unlocked Galaxy S24 Ultra is the U.S. version of this device. It is compatible with the following U.S. carriers: AT&T, Boost Mobile, Cricket, H2O Wireless, Metro by T-Mobile, Mint Mobile, Simple Mobile, Sprint, T-Mobile, Ultra Mobile, US Cellular, Verizon, Google Fi, and Visible. We suggest contacting a compatible carrier to inquire if this device would be functional when outside the U.S. If you have any other questions, please feel free to contact Support. Thank you for being a valued Samsung customer. - Debra