When adding a line on XFINITY Mobile, you typically do not need to bring your phone into the store. You can often complete the process online or through the app. A SIM card is usually involved, as each line requires its own SIM card for service. If you're using a compatible device, you may receive a SIM card either by mail or pick it up at a store if needed.
Asked Jul 20, 2025 5:34 PM