How to troubleshoot the issue as "No SIM Card Detected" on mobile router

Zyxel_Judy

Troubleshooting steps

1. Power off the mobile router and remove the SIM card.
2. Inspect the SIM card for dust or debris and clean it if necessary.
3. Re-insert the SIM card firmly into the slot.
4. Power the device back on and wait at least 5 minutes for the initialization sequence to complete. Confirm the Power LED is solid green before proceeding.
5. Using a thin object (such as a pin), press and hold the RESET button for more than 5 seconds.

Important: Holding the RESET button for fewer than 5 seconds will only reboot the device and will not re-initialize the cellular module or re-read the IMSI code. Make sure to hold it for more than 5 seconds to trigger a full reset.

If the issue persists

If the mobile router still cannot detect the SIM card after completing all the steps above, the cellular module may have a hardware fault. Please submit an RMA request for further assessment.