Yeah I've had a play with alsamixer, and I can't be sure now, but I believe that sometimes I turn the device on and the capture device isn't active and has zero volume - then other times it is active. I'm not sure if this shows a driver issue on top of the hardware one - as either way I get no response from the mic! I've tried ammending some of the settings in line with how adding a headset affects things, but still no luck.

I do however, every now and again receive a 'pop' type noise from the speakers when replaying a voice recording or video from the camera, but I also assume that could just be the speakers kicking in ready to dish out the sound that it hasn't actually recorded!

I've tried calls in both directions and using a SIP profile too. The external earphones that came with it work well - I assume this is because they hold their own microphone and just send the signal to the device for interpreting.

I'm awaiting my call back from Nokia - but might need to give them a nudge soon. I think I'll have to seek a replacement/repair for now, but I'll let you guys know if they say anything about bugs they know of etc - I'm assured that a more technical bod is looking into it at the moment.