Is it possible to trade in an iPhone like this

Good afternoon dear Apple Team,

I plan to buy new IPhoneXs in Dallas, Texas and looking for an option to give my old phone (my Boyfriend’s) to triad in and get a discount for a new buy. He has iPhone6SE. The screen and back glass were changed after it dropped.

Please, tell me is it possible to triad in phone like this and how much discount I could expect for?

thank you very much in advance

[Re-Titled by Moderator]