Turning Off Push Accounts
Another handy feature of the iPhone is the push account. If you have a supported email account, your email server can deliver new messages to your iPhone automatically and quickly, so you receive the information almost the instant someone sends it to you (see Project 32 on how to set this up).
Since a push account requires that your iPhone periodically accesses your email account over the Internet, it uses energy. If you don't need or care to receive email messages as quickly as possible, you can turn off the push account by following these steps:
From the Home screen, tap Settings. The Settings screen appears.
Tap Mail, Contacts, Calendars. The Mail, Contacts, Calendars screen appears.
Tap Fetch New Data. The Fetch New Data ...
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