Wirelessly posted (BlackBerry 7520: BlackBerry7520/4.0.2 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Most cell phones have little tabs in strategic points on the circuit board that change color permanently when wet. The first thing the techs look for are these tabs so they know whether or not to bother working on the phone. They won't swap you because the manufacturer will not replace a water damaged phone.
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Have a nice day