How much does a plan for 2 people with the iphone 5 cost monthly?

If Two people got an iphone 5 and was on a plan together how much would it cost monthly?
i wanna know how much it would be with at&t and sprint and the different types of plans they would have.

It depends on the plans they'd be getting (data, # of mins, texting). I know on ATT's site they have an option that lets you enter all that info and gives you the monthly price.