A. 1. Reinsert the SIM card: Power off your device, remove the SIM card, and reinsert it carefully to ensure it’s seated properly. 2. Test the SIM in another device: If you have access to another compatible device, insert your SIM card there to see if it’s recognized. This can help determine if the issue is with the SIM or the device.

B. 3. Check for software updates: Ensure your device's operating system is up to date, as updates can fix bugs related to SIM recognition.