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Try inserting hands-free kit/headphone jack - sometimes immediately after unplugging, the sould will work. This is usually dirt in the jack socket - it's happened to a couple of my Treos.
I sometimes clean the jack socket on my Treo650. You may be able to do this by just removing the battery, which exposes the back of the jack, but I usually remove the case (to prevent spreading dirt inside the device. Once exposed, I spray contact cleaner from the back of the jack socket, with and with out the jack inserted - jiggle it around a bit to flush out any dirt from inside.
Don't insert the battery until the contact cleaner has completely evaporated.
Hi. My son just had exactly the same problem from when he first started to use the handsfree / headphones socket. It seems that there was a fault in the socket. The phone believed that the jack was in the socket even when it was not, so it disconnected the phone's speaker and microphone. We kind of got a clue as the handsfree jack did not give a very convincing 'click' when it was put in or out. The solution was - he prayed hard and then repeatedly pulled the jack plug in and out rapidly until it the socket began to 'click' properly. He then took the jack out and it has been working fine ever since. Hope this helps. Chris
There is an error in the MobilePro 900 manual (Pages 2-2 and 2-3). The jack on the front of the MobilePro 900 is a stereo headphone jack only. The MobilePro 900 has a built in microphone.
There is no jack for attaching an external microphone.