Industrial router cannot identify mobile phone card problem

If the industrial router does not recognize the mobile phone card problem, first of all, we must find the reason for not recognizing the card, which is generally caused by the following reasons:

1. There is a problem with the mobile phone card (data card);

2. The card slot is not inserted tightly or falls off;

3. Or the sim card is not installed correctly: the "sim" silk screen on the side of the card slot should be the same as the sim printing direction of the device film;

4. Whether the size of the SIM card is appropriate;

5. The problem of the 4G module in the industrial router itself, if it is the problem, it is not easy to check, and the assistance of technical support is required.