Abstract: A system relating to assisting persons locked out of their vehicle to unlock the vehicle. The system preferably uses a coded acoustic signal transmitted through a mobile phone to trigger a control device connected to the vehicle's onboard computer system. A microphone of the control device picks up the tone, which is subsequently processed by the system. If the acoustic signal is validated, the vehicle computer will be signaled to unlock a power-locked vehicle entry point. The system comprises security elements and easy-to-access phone assistance.