iPhone stuck in "headphones" mode

This just happened to me today! I couldn't find my iPhone headphones today, so used my iPod headphones instead and it was stuck in "headphones" mode after pulling them out...weird.
Thanks for the advice, worked like a charm!
Just ***** that is the case...not to mention, if I can't find my iPhone headphones I'll have to pay $30 for a new pair! RIP OFF!!

Sign me up to the +iphone stuck in headphone mode+. I have tried all the solutions. I have even restored, but the problem persists. I think it is an issue with the switch that activates the ipod function in the headphone jack. It may somehow have shorted out or something because it happened whilst I was using the headphones and the mic and right side earphone ceased functioning. I know the earpiece works fine because if I have a ringtone playing and press the sleep/wake button to lock the phone, the click sound can be heard. even plugging in a standard headphone now starts up the iPod function.

This is really annoying because my headphones don't work well at all.

Having the same problem. It is definately a software problem and is on 2.2.1 also. To say I am mad is an understatement. If another company release software with these types of issues we would be all jumping up and down, but Apple get away with it. I have to all intents and purposes a brick as at least twice a day (usually in the middle of a call) the phone jumps into headphones mode and you need to Home+Power reboot to get sound back. All the shiney u.i. is still "lipstick on a pig" if you can't use it for it's main purpose - the phone.

See my earlier posts...nothing worked for me either. In frustration, I returned to the Apple Genius Bar yesterday to take them up on their offer of replacing my 3G with a new one for $199 (even though I'm eligible for a 3GS in early December). My logic was as follows: I either pay $399 for an early upgrade to a 3GS (and keep a broken 3G as an iPod Touch) or a get a replacement 3G for $199 and get an upgrade to a 3GS in December for $199 and have a working 3G which I'd convert to an iPod Touch and give to my kid and a new 3GS (total $398). In other words for the same price as an early 3GS upgrade I'd get two working iPhones.

At the Genius Bar they tested my phone again and suggested it was a faulty headphone socket which they couldn't fix (I still maintain it's a fault with the heat sensor). After opting for a replacement for $199, the Genius kindly offered to provide a FREE replacement (even though I was two months out of warranty). I graciously accepted his offer and now have a brand new 3G at no cost to me (which also includes a 90 warranty). My faith in Apple has been restored and obviously Apple Genius's have the discretion to offer out-of-warranty replacements on a case-by-case basis. I am now a very happy camper and my life is whole again now that I have a fully working 3G.

First, you phone should be covered under the original 90 day warranty. Don't accept anything other than a new replacement from Apple. After months of trying to troubleshoot on my own and after two visits to the Genius Bar, they eventually replaced my phone for free (even though it was out of warranty). Good luck.

Mine was doing the same thing after a back housing change! I finally figured out that there are TWO different versions of the headphone jack flex ribbon cable for the 1st Gen iPhone. The older version 821-0449-A and the newer version 821-0600-A are not compatible with one another. If you have part number 821-0600-A, then part number 821-0449-A will not work in your iPhone.
Most of them have the 0449 in them, most of the 16GB 2G's have the 0600 in them and putting that 0449 cable in them make it reverse the sound(ringer and headphone are reversed!) So anyway, that's how i finally fixed mine! get the right cable!
~Danny~