I'm unable to activate my iPhone 12 Pro Max

feya256 Said:

"I'm unable to activate my iPhone 12 Pro Max: Failed activation need update what me doing?"

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Troubleshooting "Unable to activate":

Your device is quite old. So, that may be the culprit. But, before making that assertion, try the following.

A. Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

Also...

B. "No Service":

"No Service" is shown on the top-left corner of your screen. So, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support

Hello feya256!

Please see the reply by SravanKrA in this thread: https://discussions.apple.com/thread/254678139.

I hope this is helpful. Good Luck!