See my last post on this thread...

FIGURED IT OUT! WAP Access is included in BB Unlim Plan! - Cingular

It looks like the KRB4 (Blackberry Connect Unlimited) code is their older BWC while the KBW4 code (BB UNL ADDON) is the newer BIS. It's very interesting because since it changed my WAP works without Pay-Per-Use but I lost my BIS browser..

I logged into the webclient and there's no longer an option for Sending the browser service book either...

I'm trying to decide what is more important, the BIS browser or unlimited WAP...siding towards the latter