I have a blackberry 8830 that I got with error 507 on it, it is bell branded on the phone.

I installed the latest version of the OS and the phone started up fine etc.
When I turn on the radio it always says "searching CDMA" and never gets a connection.
I tested the radio by making an emergency call "112" because I knew that here in CAN it would not call emergency services and the radio finds a signal (full bars) and goes to the bell mobility standard voice message (you have reached the bell mobility network etc etc). There are also full bars when in Emergency callback mode.
As soon as I exit emergency callback mode the radio drops signal and goes back to searching CDMA.

What can I do to solve this problem? I think that its a software and not a radio problem because there radio works fine in Emergency mode.

Can anyone help?

I've also tried installing all 3 different OS versions that are available on the download page from Bell Mobility and no luck.. the same thing happens.

any help would be greatly appreciated.

Looks like you got a defective BB. Go to Bell Mobilty and show them the issue they should exchange it for a new 8830 or one that works.

Or from the eBay seller...