How to delete an email account from my Apple iPhone 4

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Remove unwanted email accounts from your Apple iPhone 4. The associated contacts, calendar and email messages will also be removed.
Note: Some email accounts can't be removed.
1. Touch Settings.
2. Scroll to and touch Mail, Contacts, Calendars.
3. Touch the account you want to delete.
4. Scroll to and touch Delete Account.
5. Touch Delete Account.
6. The email account has been removed.