My waterproof phone got damaged by water. The electronics are fine. The unlock button simply does nothing. I can unlock the phone by plugging it in to charge it.
I am very close to buying a new phone. I can use my old one for a few weeks.
Also the phone doesn´t know if something is plugged into the headphone jack. That problem is a bit older and as far as I can remember has nothing to do with water. But I guess that this is a software problem.