3rd shooter look at camera (mobile)

I'm creating a mobile shooter (a bit like ratchet and clank) but I'm not sure how to make it so the character shoots towards where the camera is looking (using player relative controls). I know you can do it with mecanim but I don't know how to do mecanim on a mobile platform. It would also be useful if you told me how to implement this for my AI.

thanks in advanced