Losing your phone – or flattening its battery – could take on a whole new level of inconvenience from 2017 if you drive a Volvo. The company is testing smartphone tech that uses an app and the phone’s Bluetooth link to replace a car key, provided the phone is in range. The tech is being tested this year and will be offered on a “limited number” of cars from next year. Volvo says it will make sharing a car easier, allowing people to send a digital key to friends or family. Volvo says it plans to continue offering physical keys while people get used to the digital option.