Need help understanding the Tesla Y/3 Phone Key, Keyless system? This video describes how to setup your smart phone as a phone key for Tesla Model Y & Tesla Model 3. Tesla model Y smartphone app turns your phone into a Model Y Bluetooth key. It also covers how to link your phone key to your Tesla profile. Your Tesla key card and smart phone is required to enjoy Tesla keyless driving. Once setup, you won't need your key card anymore, unless your phone is disconnected or you plan on taking you car through valet.