Salutations Ann, thanks for taking the available time out of your busy day to ask us your question about the Samsung Galaxy Watch6. That's a fantastic question! BT stands for Bluetooth which means that this version of the Galaxy Watch6 would rely on your smartphone in order to be fully functional in regard to internet capabilities, text messaging, and phone calls. An LTE version of this watch would be able to connect to the internet using a cellular network of your choosing to receive its notifications, send/receive messages, and make/receive calls. Hope that helps answer your question! Please feel free to reach out to Samsung Support if you have any additional questions for us or if you would like any further assistance. Thank you for being a faithful Samsung customer. - Debra