Why won't my iPhone sound work?

I have only just purchased my new iPhone 4. I went to the beach today with it, however, I kept it in my pocket and then put it in a bag. The bag had a little sand in it and a little got in my Now there's no sounds coming out of my phone and whenever I turn the volume up it says 'headphones' when there isn't headphones or anything in that I have tried using the vacuum cleaner on it to get out any sand in it, but it hasn't changed anything. I'm so annoyed and so is my mum and she's really angry at me. Please can someone help me

Try restarting it or maybe actually put headphones in and take them out. Is it on mute?

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