http://wccftech.com/iphone-sprint-0-trade-in-deal/

Sprint has announced an updated offer for the iPhone 8 and it includes a deal for customers wanting to trade-in their current devices for Apple’s latest and greatest. In order to avail the offer, however, you will need to have an eligible handset in possession, and it will involve possessing a current-gen or last year’s flagship at the very least.

Sprint will let you get an iPhone 8 or iPhone 8 Plus for $0 per month, but you will need to have one of the following phones in possession for ‘trade-in’ purposes.