'Cellular issue detected' on my iphone 12 pro max

See these Apple articles below:

If you see No Service, Searching, or SOS on your iPhone or iPad

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Manually update your carrier settings on your iPhone or iPad

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

Update your network provider settings manually on your iPhone or iPad

Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)

Contact your cell service provider.

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

I have similar issue with my 12 pro max after updating to ios 16. I have tried everything even i tried replacing my sim card.

it says “Cellular Data Issue”

I did. Also i tried using different network sim as my phone is unlocked.