On your iPhone if new cellular update settings are available on your iPhone, when you are trying to update cellular update failed then there are several different methods to fix cellular update issue, so lets see in detail how to fix cellular update failed on iPhone 11, 12, iOS 14 and iOS 13 versions.
Cellular update failed on iPhone 11, 12, iOS 13 and iOS 14
Refresh airplane mode
Launch settings app.
Turn on “ airplane mode” .
Restart your iPhone.
Then turn off “ airplane mode” .
Now connect your iPhone to WiFi and “ update cellular settings”.
How to turn off “ WiFi calling”
Laugh settings app on your iPhone .
Tap “ cellular” .
Tap “ WiFi calling”.
Turn off WiFi calling on your iPhone.
How to turn off “ voice LTE” on your iPhone
Launch settings app on your iPhone .
Tap “ cellular”.
Tap “cellular data option”.
Tap “enable LTE”.
Select “data only” from the three options .
That’s it, Now you can update cellular settings without
getting any error. After updating cellular settings you can turn on “ WiFi
calling” and “ voice LTE” .