Yes, but see my post on the fellow who posted the "transfering phones" thread for data consequences to your esn change.

Guys sorry for posting three threads. This forum's server was having trouble last night and it basically seemed as though it never actually created the thread in the first place.

... and I was wondering whether I will be able to bring the phone that I bought from eBay to a Bell World and get one of their representatives to transfer my cell phone number from my old, dying Nokia to the new Blackberry.

The phone I bought is a Blackberry 7750 that is guaranteed to work on Bell.