In the Tesla Model 3 (2024), Model Y (2025), and Cybertruck, users can use a custom SIM card to control and wake their vehicles via SMS. The native Tesla app typically manages this by sending a message to a registered internal SIM card. However, with an external SIM, users must manually send an SMS for the car to wake up, and they should ensure to avoid unnecessary texts that could wake the vehicle unintentionally. Users are cautioned to unsubscribe their SIM from unwanted services to prevent false wakeups. Some users express curiosity about functionalities with different SIM providers such as Calyx.