Using a physical key to unlock a car door is starting to seem as archaic as operating a hand crank, and many new cars don’t even need a key for the ignition. But Volvo says it will be ready to offer a truly keyless car by 2017. The Swedish carmaker says it will launch a mobile app that can replace physical keys. This “digital key” means owners won’t even need a separate key fob to access cars. In addition to making things more convenient for individual owners, Volvo also hinted that the Bluetooth-enabled app could be useful in future car-sharing services.