Device Guides
Apple iPhone 4
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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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Search in Apple iPhone 4
How to
Delete email configuration
If you have problems sending and receiving email, you can delete the email profile and then create the profile 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 standby mode.