What could be the trade-in value of a water damaged phone

My phone has water damage and I was trying to figure out what could be the trade-in value if it still has one. All the buttons worked and the camera worked too. Now the follow technically does turn on because when you hold down the power button the apple symbol comes up but the iphone doesn't fully come up. Like I said if there is anyone that could help me find out the possible trade-in vaule if it even still has one I would greatly appreciate it!

[Re-Titled by Moderator]