IPhone 3G OS 3.0 (not able to start / receive phone calls)

Since I've updated to iPhone OS 3.0 I can't make phone calls via the "normal" cellular network. When my iPhone is on the 3G network everything works fine.
When my iPhone is on the "normal" cellular network with full signal and I try to make a phone call I get the "call failed" message after 10 to 20 seconds.
When the iPhone shows it's connected to my provider via the "normal" cellular network and people try to call me they reach the voice mail
Sometimes I can make a phone call via the "normal" cellular network and then after a couple of minutes the connection got lost and I get the "call failed" message.
Sometimes I can make a phone call via the "normal" cellular network and then after a couple of minutes I can hear the other side of the connection but they can't hear me anymore.
Sometimes I can make a phone call via the "normal" cellular network and then after a couple of minutes the other side hears my voice "scrambled" and the connection gets lost.
And again, when my iPhone is on the 3G network everything works fine!
With iPhone OS 2.2.1 everything worked fine but after the update to iPhone OS 3.0 the problems started
I tried to restore the phone now for a couple of times without restoring the backup but nothing seems the solve this issue. I tried with different SIM cards (iPhone is sim-lock free, Belgium iPhone) but all with the same issues. At this time I don't use the iPhone anymore and switched back to my old phone "Sony Ericsson K750i" because otherwise I want be able to receive phone calls when I'm in a area where there isn't any 3G network available.
Apple please fix this issue, I've got my iPhone for the "Phone" part, not the "i" part.

I have exactly the same problem with my Q-Three and 3GS 3.0. I haven't found a solution. Motorola bluetooth works fine. Previously used the Q-Three with a Samsung T919 without issue. Looks like a compatibility issue. Lots of problems posted in the blogs with iPhone and Bluetooth... If you figured it out, please let me know. Thanks.

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