I had a tripped water sensor in my 3GS. Recently, the phone would vibrate/switch between silent/non-silent mode at the slightest touch. I could squeeze it and make it vibrate. I took in into the store expecting them to send me home because I had a tripped moisture sensor (which I think was unrelated).
The Genius noticed the sensor, and said that she needed to check the phone out further. She took it in the back for a minute or so, and came out with a brand new replacement.
I'm really pleased with
on this one, for not using the tripped sensor to get out from my warranty. 
The Genius noticed the sensor, and said that she needed to check the phone out further. She took it in the back for a minute or so, and came out with a brand new replacement.
I'm really pleased with
on this one, for not using the tripped sensor to get out from my warranty. 