How much does an iphone 5 cost if you already have a plan?

I currently have an iPhone 3gs and a contract with AT&T. If I was to buy an iPhone 4s or 5, would I be able to transfer that contract to my new iPhone? And also how much does a 4s or 5 cost without the data plan?

If your contract is not up… Your probably eligible for early iphone upgrade… So ud pay 299 plus taxes so like 350 for the iphone 5…

an iphone 5 with no contract will cost about 850 with tax…

and they require a data plan no matter what

The iphone 4s with a contract is 99.99, the iphone 5 ranges from 199.99 to 399.99, depending on how much memory you want. You must have a data plan, there's no way to get around that. If you ar eligible for the upgrade, the prices listed above will be how much the phones cost, but if you are not eligible for the upgrade then the phone will cost at least $450.

Still you'll pay $450 for a contract with AT&T and regular price without data plan is $650