Will a Nokia 6265 from Asia work on the Bell network?

Nope. Never. Unless you know someone who can do ESN editing, and I'm not sure whether that's legal.

Which USB plug should you use to transfer files from a Nokia 6265i to a computer and vice versa?

So your phone can do bluetooth wireless transfers? If so you can buy and use a Bluetooth USB Adapter to transfer items to your phone. Make sure the adapter is 2.0 for the fastest transfer. Various companies make them. Are you in Canada or the USA? Either way there are some items you can look at here at NCIX.com Bluetooth Wireless (http://www.ncix.com/products/index.php?minorcatid=1024&subminorcatid=104)