Originally Posted by GreggWSmith
Well I got my iPhone last night and as a 20 year veteran of the wireless device industry I am impressed. Until tonight. I finally got around to using the headphones to listen to the ipod portion of the device but the headset jack appears to not work. I plug them in and it still plays through the phone's speakers!!! Aargh! It's a four hour round trip to the Apple store.
The speaker jack is very recessed, supposedly for 2 possible reasons: aesthetics, and to accomodate the microphone band in addition to the right/left output channels.
this means that many 3rd party headphones wont be able to sufficiently access the jack to make a successful connection. this is particularly true for ones that end in an L shape. For ones that don't end in an L shape but still do not work, the two solutions are to use an adapter - I think there are 2 currently being sold (I saw a Belkin adapter at an Apple store) - or shave off the excess plastic from the headphone plug so that it may fully seat itself into the jack. Expect to see "made for iPhone" headhpones that work out of the box; some already do.
However, if you are saying that the headphones that came with the iPhone don't work, then the jack is defective.