Cellular service drops and screen freezes in iPhone post iOS 18 update?

Anyone having issues with Cellular Service Drops and Screen Freezing on iOS18?

My phone is the 12 Pro

Cellular Service Drops

Ever since I installed iOS 18, my cellular continuously drops at random times and goes and stays at SOS mode. I would need to restart my iPhone to get out of SOS mode, but sometimes that doesn't work and I would have to wait for sometime to get it back. Also, when it goes to SOS mode, it would tell me that I didn't have a SIM card. I would take it out and clean the port and SIM card and the issue still continue.

Screen Freezing

At random times my screen would freeze and some or all buttons on the screen would not work, including the white bar on the bottom. The only temporary fix for this was to turn off the screen with the side button, in till it happens again.

[Re-Titled by Moderator]