Fix iPhone SE, “sim not supported”
How do I get my SE working, just to connect to WIFI? It recently updated software to 13.4.1 since then I can’t even get to my Home Screen. It gives me the message “sim not supported”.
Have you tried reboot the iPhone? Or switch to airplane mode and back? Or switch Wi-Fi off and back on? Or forget and re-connect to Wi-Fi? Or reset iPhone's network settings?
Sometimes the SIM card might go bad and it is necessary to get a new one from the service provider (should be free).