This made me think me think of all the applications for smartphones beyond, well, apps. It is after all a computer in your pocket. There are options with a co

This made me think me think of all the applications for smartphones beyond, well, apps. It is after all a computer in your pocket. There are options with a contextual interface, like RFC and IF (formerly known as IFTTT). The BMW example could hypothetically support an RFC tag by your door that you've pre-configured to trigger the BMW unlock API call. There's also an advantage to not having to carry around a key, replacing it with a digital trigger that lives on your smartphone. One less thing to carry around, and that goes even for the app.