There are many good reasons to allow your iPhone to update itself automatically.
An updated phone will run the latest version of apps and other software, which means the best possible user experience, and potentially protects the phone from glitches.
iOS updates also help keep your iPhone as secure as possible.
Best of all, with automatic updates, you don't have to do a thing.
On the other hand, there are also reasons to disable automatic iPhone updates.
Maybe you have an important conference call coming up and you don't want the phone to automatically restart to install the iOS update before or during that call, or maybe you're dealing with an emergency, and you need to be connected to others all the time.
Or maybe you simply prefer to control how and when your iPhone updates. Whatever the reason, it's easy to turn off automatic updates on your iPhone.
Here's how to do it for software and app updates:
How to turn off automatic iPhone software updates
1. Open the Settings app and scroll down to the General tab.
2. Click on Update Software as shown in the image.
3. Tap on Automatic Updates.
4. Tap the Install iOS Updates toggle switch to turn it off.
This will disable the automatic installation of iOS updates for your phone, but it won't prevent them from downloading when connected to WiFi.
To stop downloading updates completely, turn off the Download iOS updates toggle on this screen as well.
How to turn off automatic app updates on iPhone
1. Open the Settings app.
2. Scroll and click on the "App Store" tab as shown in the figure below.
3. In the Automatic Downloads section, turn off the App Updates toggle.
You can now manually update apps from the App Store Updates tab, or enable automatic updates again by toggling the above tab back to green.