The problem continues to get worse. More and more numbers get no audio either when they call me or when I call them. It only happens on the WCDMA 850mhz Telstra network.
The phone behaves normally on any other network or on the GSM Telstra network.
Re-flashing the phone with Miui or CM7 or CM9 or any of the official Motorola firmware's makes no difference. It is a truly crazy problem.
I am going to buy another android phone from Telstra and see if that behaves normally with my sim card. A non android phone I have behaves normally.
The behaviour is still the same, if I am on 3G WCDMA 850mhz on the Telstra network, someone calls me or I call them, it shows the call is connected, neither of us gets any audio, no hash, just silence. Rebooting the phone, changing the rom, factory resets, changing the Telstra SIM, nothing makes any difference. Switch to GSM only and suddenly the issue goes away.
My GF also has a D2G and has exactly the same issue and it is getting worse for her too.
I am guessing that the network is storing something like the phones IMEI on the WCDMA network and then forcing an incompatible audio codec. I don't know enough about the operation of the network to be able to prove anything.
I would like to find some way to force or change the audio codec that gets used when I make calls, is there any way to see what the phone is using for each call?