I haven't seen anything online about this yet so I came here to gather some insight. I'm due for an upgrade from ATT so I was thinking about upgrading to the new iphone 6 and buying it at the subsidized cost, say $399. Then in turn sell that new iphone 6 still keeping my 4S active and make a nice profit. Then I venture over to tmobile and sign up for their service, trade in my 4S and get the market value for that, receive another brand new iphone 6 in which I would use all the while tmobile pays my ETF fees. Is it that easy? Does ATT charge you for the full cost of the phone then? Anyone see any issues with that? Last time I burned my upgrade on the iphone 5 and sold it still packaged for a nice profit and I didn't have any issues. Thanks guys