Good day Madhan, thanks for taking the time 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 AT&T, Boost Mobile, Cricket, Google Fi, H2O Wireless, Mint Mobile, Sprint, T-Mobile, Ultra Mobile, US Cellular, Verizon, and Visible. We suggest reaching out to a compatible carrier of your choosing to inquire if this device would be fully functional while outside of the U.S. Feel free to reach out to Support if you have any other questions for us. Thanks for being a loyal Samsung customer. - Debra