Why won't my iphone 4 speaker work?

I dropped my phone into water and I put it in rice and its dry and it works perfectly but whenever I go on YouTube or play music the speakers won't work but for headphones it works and when I'm in speaker phone it works please tell me what the problem is thanks.

This is a glitch that has happened to a few iPhone users I know. Take it to apple, if you want it fixed, they charge £100 or something ridiculous. (Or maybe the volume is off?)

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