I have 3 phones on my account
1)Me (My iPhone of course!!)
(Family plan
2)My Girlfriend
3)My Grandmother (Her car broke down and she was stranded so after that i got her a phone)
I have the 450 anytime and 5,000 night & weekend plan and i never get close to running over. At the moment i even have like 750 rollover minutes! The only person i talk to is my girlfriend so it's mobile to mobile though.
I don't know who could use that many minutes. Trust me, I've used a lot too... =P