It's actually worse than this article states. If you get the "AT&T Next 24" plan that just means you can upgrade to a new phone after 24 months. You are actually agreeing to make 30 payments so you end up with $56 tax plus $29 x 30 or $926.
Edit: Also note that you are only eligible for upgrading after 24 months if your phone is in good condition--no cracks, chips, etc. If your phone breaks not only do you have to buy a new one, but you have to keep paying for the old one for 30 months!
It's nowhere near being "worse" than the article states. The Next plans are literally just $0 down, 0% interest installment plans. It's exactly what T-Mobile is doing, except AT&T does a really shitty job of explaining how it works and, instead of having you pay $10 for Jump to trade-in whenever you want, you can opt to trade it in a few months before the payments finish.
My friend's T-Mobile phone broke halfway through her installment plan. She had to buy a new one and still pay for her old, broken one for the next year.
It actually is worse than the article states because he calculated it at 24 months but he should have calculated it at 30 months. And if you lose, break, or even crack your phone before the 30 months--which isn't at all uncommon--you still have to pay for the old one and a new one.
Edit: Also note that you are only eligible for upgrading after 24 months if your phone is in good condition--no cracks, chips, etc. If your phone breaks not only do you have to buy a new one, but you have to keep paying for the old one for 30 months!