Hi, if your Galaxy S20 5G is displaying "No SIM" or "No SIM card inserted," it indicates that your phone is not detecting the SIM card.
Ensure the SIM card is properly inserted: Use the SIM ejector tool to remove the SIM tray. Check that the SIM card is seated correctly in the tray. Reinsert the tray securely.
Inspect the SIM card: Look for visible damage (scratches, cracks) on the SIM card. Clean the gold contacts gently with a soft, lint-free cloth.
Try a different SIM card: Insert a known working SIM card from another phone into your Galaxy S20. If the other SIM works, the issue may be with your original SIM card.
