Does this BB take a cingular 64k smartchip? I'm buying a used one off ebay and want to take my sim card out of my nokia 6102 and use it in the BB, is that possible?

You would wise to read this:
Buying a BlackBerry off eBay - BlackBerryFAQ

In your profile you have 6280. On the post title, you have 6820.
I've been around BBs for a while. There is no 6820. The 6280 is a really old device which may not work with a newer 64k SIM card.