Thanks for this. It looks like this answered the rest of my questions. I don't have to pay an additional $36 and all I need is the last 4 digits of ss# of the primary account holder and the account number itself. Also and data plan that I have on my account will automatically be removed, just not sure about the text package.
I kind of figured the iPhone would use existing MediaNet settings. Heck, the PDA and MediaNet plans both use the same wap.cingular gateway to access the internet, but AT&T charges different prices for the same pipeline. Unlike other phones, you will just not be able to edit those settings on the iPhone...at least that's what I presume.