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In this chapter we're going to look at some of the important settings and preferences that we either didn't cover in earlier chapters, or that we didn't look very closely at. Let's tap Settings. The first item in Settings is Airplane Mode. Airplane Mode simply turns off your device's cellular, Wi-Fi, and Bluetooth radios. Notice how the Wi-Fi and Bluetooth settings now say off. And cellular and personal hotspot are grayed out. If I scroll down a little, I can see that the phone setting is 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 device is not transmitting or receiving data of any kind, 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 cellphone 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. And you don't have to be on an airplane to use Airplane Mode. Again, you can 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 the iPhone will still work in Airplane Mode.
Also, as you've probably noticed or seen throughout this course, Airplane Mode is one of the settings you can quickly access by flicking up from the bottom of the screen to open Control Center. Here's the Airplane Mode button on the upper left. And I just need to tap it to, in this case, turn off Airplane Mode. Which turns all the radios back on. Notice, we also have the Wi-Fi and Bluetooth button here so we can quickly turn them off and on from Control Center as well. Control Center makes it very easy to turn on Airplane Mode, and then turn Wi-Fi back on. And, of course, once you're ready to start receiving communications again, just tap to turn Airplane Mode back off.
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