If you are not using a Microsoft Exchange push e-mail service, you can configure your iPhone to “Auto-Check” for new e-mail messages every 15, 30, or 60 minutes, or Manual. To set Auto-Check:
- Go to the Home screen
- Tap on the Settings icon
- Select Mail at the bottom of the screen.
- Auto-Check is below the Accounts section.
NOTE: The more frequently the iPhone auto-checks for e-mail, the more battery power you use. Set the time higher or set it to Manual to conserve battery power.