Hello Helen, thanks for your question about the Samsung Galaxy Watch Ultra LTE. Yes, the advertised Galaxy Watch LTE model can be used independently of your phone, allowing you to make and receive calls, send texts, and use data while leaving your phone at home. It requires an active LTE service plan with a carrier, enabling it to connect directly to the mobile network. If you have any other questions, feel free to contact Support. Thank you for being a cherished Samsung customer. - Debra