How much is an AT&T family plan cost?

So there's 5 people with phones and we would like to upgrade to smart phones. I was hoping to have unlimited text and talk but the cheapest data plan. I tried going online to see the cost but it's confusing. Can someone help me figure out and estimate of the cost for 5 iPhones unlimited text and talk with the cheapest data plan?

It says on the site that with five lines to have unlimited talk, texting, an 300 mb of data, you would pay 279.99 every month, not including taxes. And it will probably be $199 for each iPhone.

However, at T-mobile, you can get unlimited talk, text, and data for five lines (and this is for 5 Iphones too) for $210 before taxes, and each iphone will be $99.99 upfront. After 24 months, your bill will drop $100 because that iPhones will be paid for through your plan.

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