Device Guides
Apple iPhone 5c
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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How to
Deleting an email configuration on my mobile phone
If you have problems sending and receiving email, you can delete the email configuration and then create it again.
Tap Settings.
Tap Mail, Contacts, Calendars.
Tap the required email account.
Tap Delete Account.
Tap Delete Account to confirm.
Tap the Home key to return to the home screen.