Phone Tag

Basically of friend of mine showed me this website. It is quite handy, if you lose your phone, and want to call it, this site will do it, no other phone needed. Of course, when put to evil purposes maybe not so much. We've been putting in various numbers of people who are not looking for their phone, and hysterically laughing when they answer, which gives us away... What will they think of next? And how can we turn it to do our bidding? Hmmmm...