How can I be positive my iPhone is ready for trade in

Important:

• Before you sell.

• Apple Trade-In Here.

For an optional added verification; AFTER following all the steps cited …

… if you then re-power-on the phone, you should be greeted w/ a language selection screen, followed by “Hello”

When you see that …you KNOW that you’re “done” and that the phone is fully “wiped” … power-off the device and forward it to it’s next destination.