We have just experienced the same type problem with a 2-3 month old iPhone 4. Phone has never been in contact with water. Phone is nearly brand new. Phone was working fine until Friday night. Plugged into the same charging cable that has been used since the phone was purchased and it did not charge. Took it to the Apple store today to get it repaired/replaced. Apple tech took the phone in the back (magic room) and after an exam, came back and said that corrosion had been found in the dock connector and that there were white spots inside the phone indicating water damage. He then said that this voided all warranty on the phone and the "only course of action" he could authorize was to offer a $179 replacement phone. They would not even test the battery to determine if it was the problem or if it was something to do with the dock or the charging cable.
UN-FREAKIN-BELIEVABLE that this is where Apple support has digressed to. To be passing the blame for a defective design and product back onto its customers as a means of dredging up additional revenue by forcing "replacement" repairs is beyond ridiculous and bordering on criminal.
I was told by the tech that they see this all the time and that it can be caused by "transfer of corrosion from one device to another via the charging cable". As if that explains away all liability on Apples part for a phone that is new experiencing charging issues...... How stupid do they think their customers are?
I for one will be passing this experience on to as many people as I possibly can to ensure that others are aware of Apples poor customer support policy and defective product as well as their disregard for product issues that are of their design... Be warned all who think of purchasing an Apple iPhone. If you live an an area where humidity ever reaches 85% or it rains or you put your phone in your pocket or someone next to you sneezes, you might get moisture on/near your phone and the warranty will be voided by Apple so they can force you into a no win situation of having to purchase a replacement phone out of warranty.
Way to go Apple. Way to turn your customers against you for poor business practices and plain ridiculous claims.