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 anything.
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 reboot to install the iOS update before or during that call or maybe you're dealing with an emergency, and you have to be connected to others all the time.
Or maybe you prefer to simply control how and when your iPhone updates for whatever 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 Software Update as shown in the image.
3. Click on Automatic Updates.
4. Tap the toggle "Install iOS Updates" to turn it off.
This will disable the automatic installation of iOS updates for your phone, but it will not prevent it from downloading when connected to a WiFi network.
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 to 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 update apps manually from the App Store updates tab, or enable automatic updates again by switching the tab above back to green.