[mprasad198]

Originally Posted by pda luvr

To be clear: the phone is constantly switching back and forth between headphone and regular speaker, unless the headphones are plugged in.

There is no dust etc, there is a piece of hardware that gets pulled out to some extent when you pull out the headphone jack.
I used a plastic pen refill, thin enough to go inside and then pushed gently, there was "thud" kind of feeling inside as if something got pushed and fixed in place, after which it started working properly. So next time dont forget to carry a pen when using Blackberry!

[fz6yamaha]

Doing the 25 times (no 25, but few) inserts fixed the problem for us, it is definitely hardware.

[Dougster]

Originally Posted by trax95008

here's the fix!!! after downgrading to .442, still had the problem. so i downgraded to .405 so that i could return the device to ATT for a replacement. after the downgrade, i was playing around with it. i would make a call, and then plug the headset in and out. when it was in, it would stay on headset mode like it should. but whenever it was out, it would be switching back and forth. i kept plugging it in and out, until finally it stayed in HANDSET mode!!! then i was able to plug it in and out several times with it acting properly, and i haven't seen the issue since. i think the problem is that there is a flaw (bad design) within the jack. maybe two contacts really close together that were still barley touching when the plug was out. its just a theory, but seems likely considering how i fixed it. let us know if any one else is able to fix theirs this way

Thanks for the tip. I can't remember the exact sequence but it was during a call and I kept plugging and unplugging the jack, setting it to handset and headset and also toggled the mute key just before it stayed on handset. Wish I could remember the sequence.

What a royal pain this was - I was using the phone for text only the last couple of weeks. I can't believe Blackberry hasn't issued a fix for this thing, or let people know what causes it.

[John Clark]

What causes it has already been posted. Its either a defective or dirty headphone jack. Plain and simple.
Posted via BlackBerryForums.com Mobile

[pipots]

worked for me! just inserted a jack many times and voila...thnaks a lot! I was about to kill someone..haha..

[Gabrieljota]

It happens to me when I´m listening to music and I unplug the jack without stopping/closing the music app. To correct the problem, I plug in the headphones jack again, play music, press STOP button, close music app, unplug jack, problem solved.