I currently have the Nokia 6102i. I would like to upgrade to the
Blackberry 8800 but I don't really like the price of the BB data
plans. Is this unavoidable?

I would like to be able to switch my SIM card back and forth. Use the
Nokia in the evenings when I want a small phone. And use the BB during
the day when I need the all the business features. Will my current
Nokia SIM slip right into the BB?

Will I need to subscribe to different plans to make the BB work? I
currently have a shared plan of some kind with Unlimited MediaNet.

Does the email feature on the BB require something more than Unlimited
MediaNet?