There's a lot of truth in that, and generally anytime you need to troubleshoot an issue with a computer your iPhone included the first step should be to perform a quick restart. Restarting your phone will probably fix anything that's gone awry.
A restart might be in order if your iPhone is behaving weirdly. For example, the sound may not play properly, apps don't change orientation when you turn your phone sideways, or the phone seems to be running very sluggishly.
If you suspect a problem that a restart might solve, you can do it in seconds. But the way you need to restart or force-restart your iPhone varies depending upon which model you own.
Restart an iPhone 8 or earlier model
1. Press and hold the Power button (which is either on the top or side, depending on which model you own). After a few seconds, a slider should appear on the screen.
2. Drag the slider all the way to the right. Your phone should turn off.
3. Wait a few moments for the device to completely shut off. Then press and hold the Power button until the Apple logo appears. The phone should then restart normally.
Restart an iPhone X or later
1. Press the Power button (found on the side of the iPhone) and then, while continuing to hold it, press and hold either of the Volume buttons. After a few seconds, a slider should appear on the screen.
2. Drag the slider all the way to the right. Your phone should turn off.
3. Wait a few moments for the device to completely shut off. Then press and hold the Power button until the Apple logo appears. The phone should then restart normally.
It's possible that if your phone is suffering a more serious issue, you might not be able to restart your phone in this way. Don't worry: All hope is not lost, and in fact another procedure (commonly called a "force restart") will revive your iPhone and return it to normal. If the usual restart process has no effect, try a force restart.
Force-restart an iPhone 8 or later model
1. Press and release the Volume Up button.
2. Press and release the Volume Down button.
3. Press and hold the Power button until the Apple logo appears.
Your phone will now restart on its own, hopefully resolving any problems it had in the process.
Force-restart an iPhone 7 or iPhone 7 Plus
1. Press and hold the Power button.
2. At the same time, press and hold the Volume Down button.
3. Continue to hold both buttons for about 10 seconds, until you see the Apple logo appear.
Force-restart an iPhone 6s or earlier model
1. Press and hold the Power button.
2. At the same time, press and hold the Home button.
3. Continue to hold both buttons for about 10 seconds, until you see the Apple logo appear.
If none of that works
It's possible that even after trying to force restart your phone, it remains frozen, locked, or otherwise unresponsive. Your options are starting to narrow at this point, but you can still try at least one more thing.
1. Plug your phone in and let it charge for 1-2 hours. Don't disturb it while it charges.
2. After that, see if it's come back to life on its own.
3. If necessary, try to perform a force restart.
If none of that works, your best bet is to take it to an Apple store for service.
Restart your iPhone from the Settings menu
If your iPhone only needs an ordinary restart, you don't need to remember (or look up) the button combo you can perform a restart (but not a force-restart) from the Settings menu.
1. Start the Settings app.
2. Tap "General" and then tap "Shut Down." The slider will appear.
3. Drag the slider all the way to the right to shut off your phone.
4. After a few moments, press the Power button to turn your iPhone back on.
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