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iMore Question I have two iphones bought before o2 ceased to provide email services.
Okay
I cannot now delete this o2 username to replace with a current email address.
Why not? Can you not go to Settings-Mail, Contacts, Calendars and tap on the O2 account, and then select "Delete Account" at the bottom?
I cannot trade in my older iPhone until I have deleted the account.
If you go to Settings-General-Reset and then select "Reset All Contents & Settings", your device will be restored and set to used like it was when you first took it out of its box.
How can I change the locked username?
What locked username?