Same problem, and workaround, which Ive posted here
Desire microphone not activating - HTC - Android - Whirlpool Forums but also reproduce here :
Same problem here on an HTC Desire imported from the UK (to AUS). It has only happened recently, and only after the latest firmware upgrade to 1.21.405.2 (that I declined to take until a few weeks after it came out). Of course that doesnt prove its the firmware upgrade, but it certainly looks suspicious to me.
Is therew anyone experiencing this issue on an HTC Desire that has a lower firmware version than 1.21.405.2
For me this issue is easily and totally reproducible, occurring on about 50% of incomming calls, so I can just sit by a desk phone and make several calls to reproduce the issue.
From doing this I know :
1. Its not the built-in microphone because it happens with the headset too. Specifically, receiving a call and having no sound from the mic, plugging the headset in makes no difference. I can also have the headset already plugged in
and take a call, only to find it likewise muted.
2. Its highly unlikely to be the carrier, because people report this exact same problem with several different carriers across different continents.
3. Switching the phone to GSM only completely elimenates the problem, or reduces it to the extent that I cant reproduce it at all.
Anyone else find this ?