The Companion app is the latest app in personal safety - allowing you to allocate friends, family, or security departments to track your movements as you walk home. How it works Companion has a number of nifty instalments including 'smart triggers' which trigger alerts when the phone detects running, your headphones being pulled out of the jack, or you diverting off your proposed path. When an alert is triggered, the app will ask if you're ok and if you don't respond, it will