Restarting your iPhone can help fix a range of issues, from software problems to strange iOS and unexplained connectivity issues. Here's how to quickly and easily restart your iPhone, regardless of model.

How often should you restart your iPhone?
You don't need to restart your iPhone all the time. In most cases, iOS (the operating system that powers your iPhone) remains flexible and runs smoothly even after weeks or months of use.
But if you're having problems with your iPhone, restarting it could help. If, for example, a "core" iOS isn't working properly, part of the operating system may have been affected. So restarting it will help.
Some examples of issues you may encounter include the inability to make phone calls, a “black screen” when trying to use the camera, or apps not working properly. Other possible issues include noise in the sound or long pauses when launching apps , etc.
See also: How to turn off Always On Display on iPhone 14
Many connectivity issues can also be fixed by restarting your iPhone, especially if you're having trouble with your cellular service. First, try turning Airplane Mode on and off to reestablish the connection between your iPhone and your carrier. If that doesn't work, restart your phone. Restarting can also help if you're having issues Wi-Fi or Bluetooth that keep happening.
If the problem appears to be related to a third-party app (e.g. Instagram), it may persist even after restarting your device. Some problems with these apps may resolve themselves, but you may want to try deleting and reinstalling any problematic apps to see if that resolves the issue
See below how you can restart your iPhone.
Restart with Siri
If your iPhone is running iOS 16 or later, you can use Siri to restart it. This is probably the best way, as you only need to give a voice command and confirm it– your smartphone will take care of the rest.

To complete this action, tell Siri “restart my iPhone” and select “Yes” in the confirmation that appears on your screen.
You can also activate Siri by: saying “Hey Siri”, pressing and holding the Side button (on models with Face ID like iPhone X or later), or pressing and holding the Home button on models with an on- screen.
After confirming that you want to restart your iPhone, wait for the process to complete. Once the lock screen appears, enter your passcode to be able to use your iPhone again.
Restart your iPhone by turning it off and on again
To restart an iPhone, you need to turn it off and then turn it back on. The steps to do this depend on the model you're using.
See also: How to implement Parental Controls on your child's iPhone?
Restart your iPhone with Face ID
If your iPhone has Face ID (and has a notch at the top of the screen) you can disable it by pressing and holding the Side button and either volume button.
After your device vibrates and the“Slide to Power Off” slider, slide it to the right and wait for your iPhone to shut down. This can take up to 30 seconds.
After your iPhone is off, press and hold the Side button until the white Apple logo appears on the screen. Your iPhone will now start to turn on. If the logo doesn't appear after a few seconds, phone didn't turn off completely - wait a little longer and try again.
Restart with the Home Button
If your iPhone has a Home button, press and hold the Side button. Then, drag the “Slide to Power Off” slider to the right. If your model is older, there may only be a top button.
Once your iPhone turns off, press and hold the Side button (or the top button) to restart it. You'll know it's restarting if you see the white Apple logo appear on the screen. If nothing happens, check your iPhone's battery and charge it if necessary.
How to force restart your iPhone when it's having problems
If your iPhone is unresponsive to anything, it may have completely crashed. To get it back up and running, you can perform a force restart. You should only do this when your iPhone is unresponsive, like when the screen is frozen or when standard restart or shutdown instructions don't work.
Remember: The solutions listed depend on the iPhone model you have. If your iPhone is unresponsive, you probably won't be able to check the Settings app to find the model. You can visit the Find My app on iCloud.com or check Mac or iPad (under "Devices") to see which model you have.
You have nothing to lose by trying the methods below, especially if your iPhone is already malfunctioning.
Force Restart with Face ID on iPhone 8, iPhone SE (2020) or later
If you have an iPhone with Face ID and a “notch” at the top of the screen—the iPhone 8, the second-generation iPhone SE (released in 2020), or the iPhone SE (released in 2022)—you can restart your device using a series of button presses.
To restart your iPhone, first press and release the Volume Up button, then do the same with the Volume Down button. Finally, press and hold the Side button until you see the Apple. After that, release the Side button and wait for your iPhone to finish restarting.

Pressing the buttons can be a bit tricky, so don't give up if it doesn't work the first time. Keep trying and you'll eventually get it. If you're sure you're doing everything right but it still doesn't work, there's a chance you have a different iPhone model. In that case, try one of the methods below.
See also: How to find and delete duplicate photos and videos on iPhone?
Forced restart on iPhone 7
If your iPhone 7 isn't working as it should, don't panic. All you need to do is probably restart it, which is pretty easy. Just press and hold the Volume Down and Side (Sleep/Wake) buttons until you see the Apple logo appear. Then let go.

After following the steps above, your iPhone will restart. If it doesn't work the first time, try again.
If none of these instructions help you, try the following.
Force Restart on iPhone 6s, iPhone SE (2017) and Earlier Models
For older iPhone models that use Touch ID or a standard Home button , you can perform a forced restart by holding down the Home button and the Sleep/Wake button until the Apple logo appears .

The Sleep/Wake button may be located on the side or top of your device, depending on the model.
Source: www.howtogeek.com
