How much would it cost to start an att plan?

I just turned 18 a few weeks ago and I want to start my own plan with my mom and brother on it. I was wondering how much it would cost me to get an iphone 5 and they just want free phones. So I was basically wondering how big the deposit would have to be if I were to start my own plan with ATT

Here's an idea, go to AT&T's website and find out for yourself

Go to this website: http://www.att.com/...3Uo3mDXmTm Your welcome!

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