Source: http://www.engadget.com/2014/09/11/verizon-atnt-trade-in-iphone/
Sprint and T-Mobile have already promised to match and even top each others' (and other carriers') trade-in prices before the new iPhone debuted. But would you like to hear what Verizon and AT&T have to offer first before deciding which carrier to sell your soul to? Yes? Then let's start with Verizon, which will give you gift cards worth $300 for an iPhone 5S and worth $200 for an iPhone 5, 5c, 4 and 4s from any carrier if you get an iPhone 6 or 6 Plus with a two-year contract. AT&T, on the other hand, will up its minimum trade-in value for the iPhone 5S to $300, and for the iPhone 5, 5c, 4 and 4s to $200 starting this Friday. Also, you can get $100 off any iPhone if you're a new subscriber and $200 off any iPad when you sign up for an iPhone with a Next plan. You can see how much Apple's new devices will cost you under the carrier's Next pricing schemes after the break.
Of course, you can still trade in other devices through the company's respective buyback websites, but you may want to take advantage of these deals soon, because some of 'em won't be around forever. You can send in your old iPhones to Verizon in exchange for the fixed gift card values just until November 15, while T-Mobile's promo (as we've mentioned before) will have limited availability.
Filed under: Cellphones, Tablets, Mobile, Verizon, Sprint, AT&T, T-Mobile