How much would an iphone 4 cost to add onto an existing AT&T contract?

I want to switch to my dad's AT&T plan (I'm currently on my mom's Verizon plan.
I was hoping I would be able to buy an I phone 4 but I don't know what it would cost to add on a new line to his plan and how much the iphone 4 would cost.

The phone itself would be $99
how much to add to the plan depends on the plan… If he already has a family plan, it would be an additional $10 a month to add another phone, and a data plan starting at $20 a month.

if your father doens't have a data plan currently, he would need to switch, and pay the difference.

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