I think at some point Apple may approve Sprint TV as an app but to date that has not been done. Part of the iPhone is Apple control over the experience and device. You are not alone so hopefully one day it will be allowed.
Larry ~ OKIESTRO
Some of the major networks allow you to stream their TV shows on the iPhone now, ABC has a iPhone and iPod app! So we're not left out in the cold although our plans do include Sprint TV! Someday when Sprint gets off it's you-know-what!