How to improve FPS on mobile?

Hi I have a game where when I run it on my mac it runs at 58 to 60 fps but when I put it on my iphone5 it runs at 30, is there a reason it shoots down so much and it seems to stay at 30.0 majority of the time, is there like a set fps count that Unity sets default for mobile games and if so can I change it. Plus any tips for improving FPS on mobile in general would be greatly apprecitated! Thanks

By default Unity locks the FPS to 30 on mobile. Check out:

It explains how to increase FPS.