check out the BB FAQ - it should answer these questions. and here is a list of definitions:
http://www.blackberryforums.com/gene...html#post34233
Basically, BIS is only a method to get pop mail on your BB. WAP is a browsing protocal. You also have an HTML browser that uses the unlimited Data - some IM uses data such as BB messenger. I think Pocketday uses the data too.