What condition should my iPhone be in for a trade in?

We accept both working and faulty iPhones.
However, your iPhone must meet the criteria below.

Working phones must:
Power up
Be fully functional
Have no display or damage to the iPhone’s outer casing.
Have no missing or damaged buttons
Have no water damage
Some normal wear and tear are acceptable.

Faulty phones must:
Not be crushed or bent
Have no components missing
Thus we don’t accept destroyed iPhones