1 iPhone and 4 cell phones on 1 AT&T wireless plan?

there is a thing that you can do with att. You can add on a line or as many as you want for just $10 more a month. When you do that its almost like putting all 5 phones on the same plan because they will all use the same minutes. So if you have a plan with 500 minutes then all 5 phones will use those 500 minutes.