Palm treo i used headset on my palm treo and when i unplugged it the phone was still showing headset attached. Now i can hear caller but they cant hear me with or without headset.

you are going to first check the sound or volume levels of the phone if theya re all okay then you shoud see a technician to change you mouth piece

or uninstall all recently installed programs on your phone

http://www.palm.com/us/support/handbooks/treo/treo600gsm_UG.pdf

Pages 16,38 and 110-113

Hope i can of been a help to you.

You probably plugged a headset that does not have a mic. after you unplug it your phone will think that the head set is still plugged in. these phones are stupid and after you unplug the headset it will still be looking for the mic. Plug in and out the headset rapidly and then your phone will give you a notice saying that there is no mic to the headset. this will fix your problem. P.S. keep insisting, this fixed my problem

Perhaps the contacts in your headset jack are stuck.  Try inserting your headset plug and removing it a few times

just need a new earpiece speaker or it simply needs to be adjusted into place. If there is no repair shop around you or you do not want to mess with it, then just buy a $20 bluetooth headset to bypass the whole earpiece.

If I'm not mistaken, you have a mic level in sytem. If this help, mark it as helpful.TY

I had to have my Treo swapped once already because of a problem with the headset jack. The same problem is happening now - the phone always thinks the headset is plugged in (even when it isn't). That results in phone ringing (unless on virbate / silent mode) but no audio through the speaker in the back, and no speakphone icon appearing.

Given the symptoms you describe I would go to your service provider and (hopefully) get support under warranty - very likely hardware related.

Taking the battery out to switch your phone ON/Off can cause serious problems.
-------------------------------------------
To receive calls, your phone must be on.
This is different from having only the screen turned on (see Turning your phone on). When your phone is off, your calls go to voicemail. To see a picture of the person calling you!
Learn how to assign a caller ID picture in Assigning a caller ID ringtone. If music is playing when a call arrives, the smartphone rings softly. You can answer the phone as you normally would. The audio pauses during your call. To answer a call, do one of the following:
• Press Phone/Send .
• Press Answer (left action key).
• If the headset is attached, press the headset button.
To ignore a call and send it to voicemail, press Menu (right action key) and
select Ignore or press the Power/End key.
-------------------------------------------
Waking up the screen and turning it off.
Wake up the screen and leave the phone turned off when you want to use only the organizer features of your smartphone, for example, when you’re on a plane and want to look at your calendar. You can also turn off your smartphone’s screen without turning off your smartphone’s wireless features. You can turn your screen on and off by pressing Power/End.

Taking the battery out to switch your phone ON/Off can cause serious problems.
-------------------------------------------
To receive calls, your phone must be on.
This is different from having only the screen turned on (see Turning your phone on). When your phone is off, your calls go to voicemail. To see a picture of the person calling you!
Learn how to assign a caller ID picture in Assigning a caller ID ringtone. If music is playing when a call arrives, the smartphone rings softly. You can answer the phone as you normally would. The audio pauses during your call. To answer a call, do one of the following:
• Press Phone/Send .
• Press Answer (left action key).
• If the headset is attached, press the headset button.
To ignore a call and send it to voicemail, press Menu (right action key) and
select Ignore or press the Power/End key.
-------------------------------------------
Waking up the screen and turning it off.
Wake up the screen and leave the phone turned off when you want to use only the organizer features of your smartphone, for example, when you’re on a plane and want to look at your calendar. You can also turn off your smartphone’s screen without turning off your smartphone’s wireless features. You can turn your screen on and off by pressing Power/End.

there are known compatability issues with palm treo and blackberry phones when trying to use this type of headset .

I recomend a Plantronics brand headset with your phone.