Welcome to the forums.
Have you reported to Bell that the device was stolen? If you have a backup of your data from the 8330, you should be able to restore it to your previous device without issue. As for unlocking, I don't think it's possible. I know that's how the major CDMA providers in the States work (Verizon and Sprint). I just did a quick Google search, and all I've seen so far is that it's not possible.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]