How Do I Stop My iPhone From Updating Apps?
Downloading and installing app updates automatically can save you time and a lot of taps on your phone.
MoveApp Updatesslider to off/white.

If you have limited data but still want to have up-to-date apps, there’s another option.
With that, apps will only auto-update using Wi-Fi.
You may also want to move theAppsslider to off/white.

Disabling this setting prevents apps downloaded on other Apple devices from being automatically downloaded to this gear.
How Do You Turn Off Automatic OS Updates in iPhone parameters?
Just like with apps,iOS updatescan be automatically downloaded to your iPhone.

These updates are extensivesometimes multiple gigabytesso they can drain your battery and use up your limited data.
Technically only the download of the OS is automatic.
It doesn’t install automatically; you still have to choose when to install it.
Still, you may want more control.
If so, turn off automatic OS updates by following these steps:
TapGeneral.
Move theDownload iOS Updatesslider to off/white.
Why Turn Off Auto Updates?
Setting your iPhone to update apps automatically and the OS can be helpful.
FAQ
Check to see if auto-updates have been turned off.
If you’re still having problems, check your available storage as well as the date and time parameters.
If you want tocancel an iPhone updatein progress, turn on Airplane Mode.