My bold always show "Radio Path unavailable", then the call failed? but the signal is full!!!!
and now i totally cant make and receive call in my room, but not outside the building!!
Also I want to ask how can I connect to the Bold using bluetooth to use the 3G network on my MAC???

Can't help you on the bluetooth.

But I would ask what OS you are running on? If its not .162 or higher I would suggest updating it. there is a thread with a link to a legit .162 release for your Bold. I would start there and see if the problem goes away.

I agree, update the OS on the Bold. I had the same issue with mine running an old OS.

As for the BlueTooth modem on the Mac, here is a link to the scripts if you are running 10.5.

Updated Modem Scripts for OS X 10.5 (Leopard) - Fibble.org

It works nicely. I use the script for the 8800. When I was actually using an 8800 I would only get one session before a hard reboot of the BB was needed. With the 9000 there doesn't seem to be the same problem.

Today I found the way to fix out the "Radio path unavailable" problem.
Go to the Mobile Network Options, and change the Network Mode to 2G only, then it all works, now I can receive and make calls in my room, but not in the 2G&3G mode. That's wired. and I also updated the OS, the newest OS also has the same problem, and the only way to fix it is by changing the Network Mode!!!
RIM really need to update the OS asap to fix this problem.