I have 2 lines on my phone and for years I am able to get the newest phone by using one of the upgrades. I then give my wife my old phone and sell the oldest model. Rinse and repeat. Am now looking at AT&T Next as an option. I was reluctant as I will not be able to sell my phone to help pay for the newest model. However, the math may suggest that it is more or less unless I missing something. Old way of upgrading: Buy phone: $400 Upgrade fee: $40 Monthly Device Payment: $0 Discount on plan: $0 Sell old phone: $180 Total: $260 (my annual cost of upgrading) Using AT&T next: Buy phone: $0 Upgrade fee: $0 Monthly Device Payment: $42.50 * 12 = $509.40 Discount on plan: -$20 * 12 = -$240 Sell old phone: $0 Total: $269.40 (my annual cost of upgrading) The difference is negligible but the plan discount comes from me downgrading from unlimited data to 4GB. We have never used more than 3GB in two years. I also get unlimited text and voice and hotspot access though I've never gone over on minutes and texts. Also the price of the sale of my old phone is my experience with selling to Gamestop, Craigs list or Gazelle in a best case (50% of original subsidized value). Am I being lured into something here? Am I missing something? Obviously unlimited data will be gone for good but I might be holding onto that for sentimental reasons vs. what I really need and use. Any insights or advice would be appreciated. Thanks!