6 and 6p aren't great but especially for the 4 , 5c, and 5s,the trade in is pretty good, higher than a fair condition iphone in the open market.
"Beginning September 12, you can get a trade-in value of $100 for an iPhone 4 or iPhone 4s, $200 for an iPhone 5 or iPhone 5c, $300 for an iPhone 5s, $350 for an iPhone 6 and $400 for an iPhone 6 Plus when purchasing a new iPhone 6s or iPhone 6s Plus."
Verizon to Offer iPhone 6s & iPhone 6s Plus on America’s Largest 4G LTE Network Beginning Friday, September 25
Sent from my Verizon Samsung Galaxy Note 5
"Beginning September 12, you can get a trade-in value of $100 for an iPhone 4 or iPhone 4s, $200 for an iPhone 5 or iPhone 5c, $300 for an iPhone 5s, $350 for an iPhone 6 and $400 for an iPhone 6 Plus when purchasing a new iPhone 6s or iPhone 6s Plus."
Verizon to Offer iPhone 6s & iPhone 6s Plus on America’s Largest 4G LTE Network Beginning Friday, September 25
Sent from my Verizon Samsung Galaxy Note 5