How much would an iPhone 5 cost with T-Mobile Family Plan upgrade?

I want an iPhone 5 on my T-Mobile family plan but I need to know how much it would cost first.

~4 Lines
~3 4G data plans
~2 lines limited talk and text before 9:00 pm (Not including Mobile To Mobile)

The iPhone 5 would initially cost $99.99 down for the cheapest model. However, buying the iPhone 5 will add $20.00 to your bill every month for 24 months. If you already have a data plan on the line you're going to use the iPhone 5 with then it won't cost you any more.

Although if you're getting the iPhone 5 on a brand new line, you will have to add a data plan.

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