Dropped iphone, now I can't hear calls?

So I dropped my iphone 5 last night and I think I broke it. I tried calling my mom before and I had the volume turned right up, it said it was ringing, but I couldn't hear anything.

What could be wrong. I can't listen to music fine on it.

Check button on side is not on mute. Reset phone to see if this corrects it. Hold sleep/wake button and home button till you see apple on screen then release. This is not instant and can take thirty seconds or so.