The ringer/silent mode switch on my iphone 3g broke. It looks like a little piece of plastic right next to the switch came off, and now the switch is stuck in the silent position. I got it last August so it is still under warranty, but I have some questions: 1. Is there still a waiting list for iphones, or can I just go into an AT&T store and get a replacement iphone the same day? 2. After I do a backup of my iphone, is there a way for me to wipe out all the information on there before I trade it in for a replacement? I read in the iphone manual about a reset option, but that only deletes preferences and settings, it doesn't delete contacts, calendar info and other stuff. How can I delete EVERYTHING (including browser history and cookies)? 3. What happens if I wait until July to get a replacement iphone? By then a new iphone might be out, will they give me the new model for free, or would they charge me for it?