To save even more battery power, and (on a plane) to comply with flight regulations, you can turn off all three of the iPhone's network connections in one fell swoop. You can also turn off Wi-Fi alone.
To turn all radios off. When you turn on Airplane mode (tap Settings, and then turn on Airplane Mode), you turn off both the Wi-Fi and the cellular circuitry. Now you can't make calls or get onto the Internet. You're saving battery power, however, and also complying with flight regulations that ban cellphones in flight.
To turn Wi-Fi on or off. From the Home screen, tap Settings→ Wi-Fi. Tap the On/Off switch to shut this radio down (or turn it back on).
Once you're in Airplane mode, anything you do that requires voice or Internet access—text messages, Web, email, Weather, Maps, and so on—triggers a message. "Turn off Airplane mode or use Wi-Fi to access data." Tap either OK (to back out of your decision) or Settings (to turn off Airplane mode, turn on the antennas, and get online).
You can, however, enjoy all the other iPhone features: use its iPod features, work with the camera and photos, or use any of the mini-programs like Clock, Calculator, and Notes.
You can also work with stuff you've already downloaded to the phone, like email and voicemail messages.
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