Camera on iPhone 4 messing up?

My front camera doesn't work for some reason, and my camera app is stuck on the front camera. It won't let me switch it. I thought the whole camera was broken until I got on instagram and tried to take a picture and it worked until I switched it to the front. Does anyone know how to fix this problem? I don't care about my front camera, I just want to be able to use my original camera app.

Turn the phone off and back on again, if that doesn't work there's not much to do, exept give it to the apple store

Did you try to do a hard reboot?
Hold the lock button and home button at the same time for about 10 seconds.

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