I've had my white iPhone4 about a year, and really like it alot and enjoy using it very much! A couple days ago I used the Apple headphones. Afterwards I noticed the clicking sounds on the keys were silent. So, I first checked my Sounds in Settings to be sure the key sounds were "on" and they were. Then I tried increasing the volume with the button on the left side. The bars increased, but in parenthesis it had (headphones). The headphones were not still engaged with the phone. I checked the ringer and it still worked. So, then I rebooted the phone, but that didn't cure it. After a few hours the phone corrected itself and it is fine now. But, I wonder if the same thing will happen when I use the headphones again. Actually I think it has done this before but at that time I wasn't paying attention. And as this time, it did later correct itself. Any thoughts or suggestions on this? Thanks.