When the Cellular Router module does not receive a signal, you can try the following methods to troubleshoot and resolve the problem:

  Check the SIM card:

  Ensure that the SIM card is inserted correctly and is valid. Please note that different carriers in different regions may require different SIM cards. If possible, try testing with a SIM card that you know is available.

  Check the antenna connection:

  Make sure the 4G antenna is properly installed on the router and the connection is tight. If you have an extra antenna, try a replacement to rule out the possibility of a damaged antenna.

  Check signal coverage:

  Move the router to a location with a good signal to test, such as near a window or on another device where the signal is tested. Signal strength may be affected by building structure, terrain, etc. Changing the location of the device may help improve signal reception.

  Confirm carrier network settings:

  Confirm that the carrier information and network mode in the router settings match the SIM card provider. If necessary, you can contact the operator for relevant parameter information, such as APN settings.

  Software updates:

  Check the firmware version of the router to make sure that you are using the latest version. If the firmware is too old, it may affect signal reception and device compatibility. Follow the manufacturer's instructions for the firmware upgrade.

  To reset the router:

  Attempt to restore the router to factory settings to troubleshoot signal reception problems caused by incorrect settings. Note that the router will need to be reconfigured after the factory reset.

  Contact the manufacturer for support:

  If the above methods fail to solve the problem, it is recommended to contact the manufacturer's technical support department for professional assistance. There may be a hardware failure or other problem that requires further diagnosis and repair by the manufacturer.

  With the above methods, you should be able to find out why the Cellular Router module is not receiving signals and take appropriate actions to resolve the problem.