My sons iphone 4 is 11 months old. It suddenly stopped taking a charge through the connector. Went to Iphone shop where the technician said the contacts shows signs of oxidation (corrosion). The phone must have been subjected to water and therefore it was not covered on guarantee. I said that this was totally unacceptable as the phone had not been subjected to water but used normally. Coincidentally a lady next to me said she had exactly the same problem with a 10 month old phone....! I suspect there is a design floor in the materials/finishes used on the connector. Has anybody else experienced this?