The program will be run by CExchange and the smartphone owner will have to answer a series of questions to help determine how much his trade is worth. The program is available at 3,600 participating Walmart and Sam’s Club locations nationwide. Some of the examples mentioned by Walmart included: $300 for an Apple iPhone 5, $175 for a Samsung Galaxy S III and $52 for a Samsung Galaxy S II. Apple recently started accepting trades at Apple Stores and both Apple and Walmart are competing against third party companies like Gazelle.
Walmart customers interested in a trade-in should head to the electronics department of their local store where the value of the trade will be applied against the current low Walmart prices such as the Apple iPhone 5, available for just $98, and the Samsung Galaxy S4, priced at just $138. Both of those prices are based on a signed two-year contract from Verizon, AT&T or Sprint.
source: Walmart via SlashGear