AT&T is $15 per phone for off contract phones and for AT&T Next. That means if you bring an unlocked phone the add on for a family plan is $15. $40 is only for subsidized phones until the contract runs out, then it drops to $15.
If you get a subsidized phone on AT&T you pay $25 a month more for your plan...for 2 years...that is $600. So basically whatever down payment the phone requires plus $600 is what you pay.
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