BB Curve 8520/8530 :: Saved Contact Number Goes To "Work" Number By Default

I am new to this whole Blackberry thing, so please... take it easy on me.Anyway, whenever I add a new contact from a phone call or whatever it, by default, goes under as their "Work" number. Even when I transferred numbers from my Envy to my Blackberry a lot of the contacts went under "Work" rather than "Mobil".How can I change it so that by default it comes up under mobile (since that's the majority of numbers I add to my contacts)?Also, is there a way to easily switch the classification of a number? Lately I've been just going into the contact and retyping it, but doing that for all of my contacts will be a pain.