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Greetings NetworkConnectabilityandSD, thank you for taking the opportunity to ask us your questions about the Samsung Galaxy S25 Ultra. The advertised unlocked Galaxy S25 Ultra is compatible with AT&T, Boost Mobile, Cricket, Google Fi, H2O Wireless, Mint Mobile, Sprint, T-Mobile, Ultra Mobile, US Cellular, and Verizon. We recommend reaching out to the carrier of your choosing to inquire about your SIM related question. The S25 Ultra does not offer expandable storage, however, cloud-based storage options are available if you're interested. Feel free to check out, "Manage storage on your Samsung Galaxy phone" if you would like to learn more about these options. Let us know if you have any questions for us afterward or if you would like any further assistance by reaching out to Support. Thank you for choosing Samsung! - Debra
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