I now have a BB7280 on Rogers and I just purchased a 7100t Unlocked unit.

My question is how do I switch the BWC settings, and would I be able to keep my old PIN or do I have to use the one on the new unit?

On the BWC (in the profiles section, I think) is a page to change the BB associated with the Web Client. The PIN is hardcoded to the device and you can not change it.

Unless, you request transfer of the BB provision from TMO to Rogers, you will not be able to use the BB function. Rogers service book has to load on your device once your device PIN/IMEI is provisioned from TMO to Rogers.

How do I do this, I was using a Cingular 7280 and I didn't have to change anything, I just used cingulars BWC.

Could I conceivably use T-Mobiles BWC? The unit appearantly has already been used on the Rogers network, so would that mean all the switches have been done?

You have just to sign into bwc web site and change the handheld. This way the handheld will be active supposing your new handheld is really unlocked and not tied to any email account. You can switch back and forth if you want to operate with both devices too simply by doing that.

What about switching your information, such as phone book, saved messages, from one unit to another? Ie, if I change over from my 7290 to an 8700, how do I do this?

Use your desktop manager for that function . . .