Yes DCT4 phones like the 6620/7610/6600 etc. are easy to unlock. But.......all Nokia phones since the 6630 are BB5 which no one has been able to unlock. So far the only way is for the provider to request a code from the manufacturer.
Blackberry support would make me leave the N95 behind. Sad to say, but convergence of two "cell phones" would be more important than the convergence of camera, cell, and GPS. Work just forces me into BES.