How to fix cellular update failed after so many troubleshooting steps, reset network settings, reset device settings, reinsert SIM card, hard reset but it’s still there cellular error, under general>about no network available. This happened after installing iOS 15.4 on iPhone 12
iPhone 12 Pro Max, iOS 15
Support article: If you see No Service or Searching on your iPhone or iPad - Apple Support
Go through the various suggestions in the support article above but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation. You should be able to reach them here
Contact - Official Apple Support
or phone numbers
Contact Apple for support and service - Apple Support
Support article: If you see No Service or Searching on your iPhone or iPad - Apple Support
Go through the various suggestions in the support article above but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation. You should be able to reach them here
Contact - Official Apple Support
or phone numbers
Contact Apple for support and service - Apple Support
Me Too. Same Error
Same remedy
Cellular error no network available after iOS update 15.4
