I'm not understanding what the complaint in that is, exactly. Is it that the Sprint/cellular side of the usage is limited while the wifi usage is not?
Yes, and while I can understand why, I hope others will find a better solution.
The AT&T base iPhone plan has 450 minutes, (vs. 550 cellular, unlimited wifi here) for $40 plus $5 for 250 texts plus $15 for 200 MB or $25 for 2 GB. That's a total of $60/month at minimum. I really don't see what the complaint is here.