I just found this blurb on the web site:
--
Sprint Power VisionSM Packs are not available with Sprint Mobile Broadband CardsTM, Sprint PCS Connection KitsTM, and cannot be used for phone-as-modem purposes.
Unless a Sprint Power VisionSM Pack is selected, customers with a Sprint Power VisionSM Phone will be charged 3¢ per kilobyte for Sprint Power VisionSM usage.
See:
https://manage.sprintpcs.com/rpa/visionMatrix.html
--
This seems to imply that you CANNOT use the phone for Internet AND as a Modem unless you want to pay .03 KB. Unless the Phone as a modem INCLUDES web access which would make sense.