Trade in an installment phone that haven’t finish the installment

If you purchased using the Apple Upgrade program, you can trade in after 12 payments.

If you financed your device, you can trade it in but you'll still owe remaining payments on the device.

"Trade in an installment phone that haven’t finish the installment: Can I trade in an installment iPhone that haven’t finish installment yet?"

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Trade-In Option:

That depends on the model and its condition. If not set up, then you should have no worries with account issues. So, where does the installment stand? If this is associated to your account, then you should finding the installment, and then perform as instructed here, including the iCloud logout: What to do Before you Sell, Give Away, or Trade in your iPhone or iPad - Apple Support

Finding the Estimated Trade-in Value:

1. Go Here: Apple Trade In - Apple
2. Click: "Find your trade-in value" on the top-right corner of the screen.
3. Proceed from there as Necessary