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In this Chapter, we're going to look at some of the important settings and preferences that we didn't cover in the earlier chapters or that we didn't look at very closely. Let's tap Settings. The first setting on the iPhone and iPod touch is Airplane mode. Airplane mode simply turns off your iPhone's cellular, Wi-Fi and Bluetooth radios. It does the same for the iPod with the exception of the cellular radio, which the iPod doesn't have. Notice how the Wi-Fi and Bluetooth settings are now set to Off. If I scroll down a little, the phone setting has faded back and it also says Airplane mode. The other indicator that I'm in Airplane mode is the little Airplane icon in the upper left-hand corner which stays there as long as you're in Airplane mode.
So, Airplane mode means that your iPhone is not transmitting any kind of data and it can't connect to the Internet or receive calls. This is useful not only if you believe that cellphone signals interfere with airplane communications and other functions, but also if you want to save battery power on a long cross-country plane ride. If you're out of range of a cell phone tower, your iPhone will keep searching for a signal, which will quickly drain the battery. Airplane mode basically tells your phone to give up the search and you can save the battery for watching videos, playing games, or taking pictures of other people on the plane. It's important to note that once you turn Airplane mode on, which again shuts down Wi-Fi among other things, you can then turn Wi-Fi back on.
Many airlines offer in-flight Wi-Fi networks these days, so if you want to be able to connect to the Wi-Fi network on your plane, but stay in compliance with federal regulations about keeping your phone turned off, just turn on Airplane mode and then turn Wi-Fi back on. You don't have to be on an airplane to use Airplane mode. Again, turn it on to conserve your battery or when you don't want to be disturbed while you're watching a video or listening to music. Anything, that doesn't rely on connecting to the Internet or the phone part of iPhone, will still work in Airplane mode. Once you're ready to start receiving communications again, turn Airplane mode off.
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