iOS 18 Cellular Issue Detected

I'm not sure why my previous question was deleted, but I'll repost:

I updated my iPhone 12 to iOS 18.3.2 and now my phone will not connect to service. After restarting the phone I receive a notification from System Settings "Cellular Network Issue" and it is stuck searching for network bars with "No Service" showing. After running diagnostics with Apple Support the technical advisor told me the "software update exposed a hardware issue". I can't toggle Cellular Data or access any Cellular settings in System Settings, and my SIM card works fine in other phones so it seems to be an issue with the phone.

This seems to widespread issue with multiple reddit threads documenting the same issue after an iOS 18 update:

https://www.reddit.com/r/ios/comments/1fjszx4/anyone_else_data_not_working_after_updating_to/

https://www.reddit.com/r/iphone/comments/1gow5vk/ios_181_update_bricked_iphone_12_now_on_but/

https://www.reddit.com/r/ios/comments/1fjszx4/anyone_else_data_not_working_after_updating_to/

My phone was perfectly functional with the previous iOS and now no longer connects to service. I can't call, text, or use data. How is there not an Apple Service Program for this? Are there seriously not enough people reporting the issue to Apple and just buying a new phone? It seems ridiculous.