Choose message tone
Turn screen lock on or off
Set up your mobile phone for POP3 email
Set up your mobile phone for MMS
Change screen brightness
If you have problems sending and receiving email, you can delete the email account from your mobile phone and then set it up again.
Find "Accounts & Passwords"
Tap Accounts & Passwords.
Delete email account
Tap the required email account.
Tap Delete Account.
Tap Delete from My iPhone.
Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.
Tap anywhere to dismiss
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