My phone isn’t working after the new update
why is my phone not working after the update
iPhone 12 Pro Max, iOS 15
"Not working" is a wide remit to answer.
Try this
No service or searching
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