Got to bring something to your attention. I recently installed 12.09 (damn, you released 12.10 just now?) and its amazing, really a feat how its so responsive and stuff... but after installing a certain software using your download manager or perhaps using a back up, my phone started playing up...
sms's wernt getting delivered (even though it was shown as sent) and when I made calls, the person receiving it couldnt hear me, and when they called me I couldnt hear them... I thought it was the radio, so I upgraded from 184.108.40.206 to 220.127.116.11 and again, the same issues... it wasn't until i hard reset and didn't install any software using your Download tool that it started working properly again... might be something that needs to be looked into?
I'm with Optus as you might already know from our PM