> Waking up the car The native Tesla mobile application wakes the car by sending an SMS to the internal SIM card number. This number is registered in the Tesla database. When using a custom external SIM, you must manually send an SMS (with arbitrary text) to your SIM number. Any SMS will wake up the car, and it will be available via the Tesla mobile app. Don’t forget to unsubscribe your SIM from any newsletters to avoid false wakeups and extra power drain.

Wow..