Have you been humming some advertisement jingle all day for no specific reason? If yes, don’t worry! It happens all the time. We all connect with jingles in one way or the other. Understanding this revenue potential, co-founders Divya Pratap Singh, Rakesh Sehgal and Gaurav Tiwari have come up with a mobile application, PayTunes, which changes your mobile ringtone to play the latest jingle of various advertisers that have signed up with the start-up. For every incoming call received, users get reward points with which they can pay bills or get a recharge.