I bought the iPhone 3G a week after it was first put on sale. I have been using the headset/headphones that came with the phone for train and subway commutes at a normal volume. I've been noticing that after only about 3 weeks of use, the right speaker seems to have feedback or a sound like something is loose and rattling inside the headphone. Will Apple exchange these for me at the genius bar? It's not like it's too much to buy another set of $30 headphones, but at that point, I would just buy the Shure adaptor to use with my Shure headphones which have much better quality.