Turnoff find my iPhone on an old device
I forgot to turn off find my iPhone on my old device before transferred everything to my new phone and now I can’t turn it off on my old device.
Question marked as
On your new phone.....
Tap Settings
Tap [Your Name] near the top of the screen
Scroll down to find the list of devices using your Apple ID
Tap on the device that you want to remove
Tap Remove From Account