After installing a software update on the 18th of November on my Galaxy S23 Ultra, my phone has been unable to maintain connection to the mobile network. It disconnects every few minutes and displays 'Emergency Calls Only'. The only workaround is to either restart the phone or enable then disable airplane mode. However, this only resolves the issue temporarily. I have tried all troubleshooting steps I can find online but none have worked. I have spoken to my network operator, and they have informed me that this is a Samsung issue. They’ve had several other customers raising the same problem. I’ve also spoken to other Galaxy users who have had the same experience.