1. Ask if Bell will unlock it. They might.
2. CDMA phones don't use the SIM card -- that is for international use -- so it would be fine.
3. The 9000 is a GSM phone which can be readily unlocked. They also want to sell you something.
4. Almost certainly the UK data plan will not have BLACKBERRY data on it. One of the UK firms (O2?) has pay as you go BB data. Regardless, it won't check the
address if that is what you are using. If you're using a different email address you should be able to get it to work if the data plan is a blackberry data plan.
Personally, I bite the bullet and purchase Sprint's unlimited international plan when I travel. Does Bell offer one of those?