Turning Off Wi-Fi and 3G
If you frequently surf the Internet to look up map directions, watch YouTube videos, or browse your favorite web pages, you'll want to leave Wi-Fi turned on. If you turn Wi-Fi off and access the Internet, the iPhone uses your cellular telephone network, which requires more energy and drains your iPhone's battery in the process.
To make Internet surfing fast over cellular telephone networks, the iPhone uses a technological standard known as 3G. You can turn off 3G to reduce your iPhone's power consumption.
To turn off Wi-Fi and 3G, follow these steps:
From the Home screen, tap Settings. The Settings screen appears.
Tap General. The General screen appears.
Tap Network. The Network screen appears, as shown in Figure 2-2.
Tap the ...
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