Before inserting a mobile SIM card into a 4G router, please check the SIM card and ensure no golden contacts are broken.
If the 4G router is unable to detect the SIM card or get the error message of “SIM card unavailable (or missing)”:
- Firstly, please verify if the SIM card is inserted correctly. Refer to the SIM card installation guidance.
- Secondly, please check if the SIM card is clean, especially on the golden contacts.