I LOST MY IPHONE! Please

Okay so I have Find my IPhone installed on my iPad (which I'm using right now) and it's not on my iPhone (which is lost) when I look on my iPad it's not showing the my iPhone. And I can't call it because I put it on do not disturb and every time in call it says "This person is not currently accepting calls. Try again later". UGGHH. What do I do?

App needs to be installed on the device you are tracking

The application has to be on the device although there's a back up that only your network provider can access so give them a call