Volume bar disappeared on my iPhone 4s?

I put my phone on an iphone dock and when i took it off my volume bar disappeared. I tried cleaning it, i tried holding the top button and double clocking the home, i've rebooted it, turned it on and off. Nothings working, please help

Same happened to me, water has got into your iPhone.
It eventually cleaned itself in my case but you could put it in a bag of rice for 2 days to soak up the water.

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