Holding a Key Fob to Head Boosts How Far Away You Can Remotely Lock/Open a Car? And it's reportedly 100% safe.

HOW TO USE DIGITAL IPHONE CAR KEY Exactly how the virtual key works might depend on your model of car. For instance, some cars will let you use it to remotely lock and unlock your car.

Once you're all set up to go, simply open your car-makers app, and pair your car to your account. Then find the option for Digital Car Key and follow the instructions.

Thieves can hack key fobs and steal cars using signal boosting. Here's how to prevent your key fob from being hacked.