Access Your Tesla App on a Different Phone Call 877-798-3752 to reach Tesla Roadside Assistance.

Use a phone charger with a backup battery. Get a friend's phone to download the Tesla smartphone app

Use your username and password to log in. Toggle "Controls"

Choose "Start" Your Tesla will "remote start" and have its doors unlocked for two minutes as a result. 

The doors will lock once more as a safety measure after two minutes.

This is a temporary fix because your friend now has access to your Tesla, but it will function in an emergency.