How much does it cost to activate an IPhone 4?

How much does it cost to activate an IPhone 4 under a 2 year plan with at&t?

I use Verizon but I'm sure they are both the same. For me it does not cost a thing since you used your money to buy it, it is basically a free service. If you have gotten a phone activated there before and it "does" cost something, it is probably the same price for any phone.

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