Anyways, to get back to the original objective of this thread...
If you have a typical VOICE plan (Get More or MyFaves),
the $19.99 BlackBerry data addon you have is ON TOP of your VOICE plan.
This $19.99 add-on ONLY provides unlimited EMAIL as well as INTERNET/DATA.
It does NOT include any SMS or MMS.
Meaning, without one of the text messaging bundles offered, you will be paying out of pocket for each of your text messages and picture messages.
So, if you text a lot... I highly suggest you snag the appropriate package for your level of use.
The $29.98 BB addon is essentially the same thing as the $19.99 plan, with the exception that it is only for Enterprise Server (BES) users.
The plan that wingrider78 is on is an all around package for the single user who wants to jump right on a BlackBerry.
It is a standalone rate plan that is inclusive of air time, data/email, as well as text messaging. (There are different levels of this package as well, to target different peoples use. The basic BB Minutes/Data plan only has 300 SMS included.)
Just wanted to clarify