I have the same problem. Initially I was intermittently losing transmit audio but a restart of the phone would fix the problem. Now I have completely lost mic functionality in call as well as using the voice recording or Google seach app. Have re-started phone several times, unistalled heaps of apps (hence numerous restarts) still no joy.
I'm with Telstra in Australia. I rang them to find out if this was a known issue and if there was a work around. Got the usual poor Telstra customer service; actually spoke to five different reps during the course of the phone call only to end up with a girl in what was obviously an offshore call centre who seemed to have limited ability in terms of English comprehension who told me to take the handset to a Telstra store...thanks Telstra.
Anyway looks to me like a hardware issue although others have had some success rooting the handset or swithching off 3G connectivity. The fact that even the native voice recording function is not working for me makes me think that it's more than just a radio issue as seem to have been the case with others as described above.
Pretty dissapointed right now, have to say that the lustre was already starting to wear off for me for this device but I was holding out optimistically for Froyo. Might have to think about WinMo 7 when that hardware starts hitting the shelves.
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