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My phone had got damp (not soaking wet, but some moisture got inside) and would not turn on anymore, even after waiting a couple hours. But I thought about putting it in the refrigerator because I knew that it dried things out (e.g. would dry foods no properly wrapped). So I put my phone on the fridge door for about 30 mins. Took it out, put battery and everything back in, and it turned on like normal. So I can confirm that for my case, the refrigerator may help with a moisture problem.