Sound on iphone not working?

I have an iphone 4 and my sound isn't working with or without headphones in.
it comes up with a funny icon like the ringtone but there are no bars, how do i fix this?

Added (1). I've also cleaned out where the connecter goes and that was full and then the sound comes back but almost staright away it goes again. Please please help me.

Have you went to your sound settings? It may have been turned down.
Have you turned it off and on?
Do called on speaker work?
If not even calls work after trying these things I'd take it to be fixed.

Sometimes the earphone hole gets dirty and the phone still thinks you have earphones in when you don't. Try plugging in the earphone a few times and see if that makes the sound come back. It will need to be cleaned

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