Okay first of all me and my wife are at&t customers and we each have an iphone with the data plan together. And the plan is not unlimited. My question is I want to add another line that is unlimited no data plan and no smart phone to the current plan. I see that the individual unlimited plan is $69.00 (no data). Will it be cheaper if I add another line to the existing plan that me and my wife has or will I still have to pay the full $69.00. I am on a budget just wanted to know.