I updated my iphone 12 pro max to 15.5 and lost network

Manually update your carrier settings on your iPhone or iPad - Apple Support

kirane Said:

"I updated my iphone 12 pro max to 15.5 and lost network: How can i fix this situation? The phone is sayi g its unable to activate due to a update"

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Thank you for the screenshot.

Troubleshooting iPhone Activation:

A. Getting Around this Error:

1. Go Here: If you can't Activate your iPhone - Apple Support
2. As it Reads: If your iPhone can't be activated or an alert says the activation server is unavailable or the SIM card is unsupported, learn what to do.

Then click on the Get Support link at the top right of this page to start the service process.