How to check your mobile phone card number?

You can query through the web page, and the method is as follows:

Operating environment: Xiaomi 1 1, MIUI 13.0, mi browser 2.77, and one-pass search 2.6.

1, open the phone, click the browser icon, and run. As shown below.

2. After running the browser, use the browser to search for "one certificate general query" and find a link with the word "official" in the search results. As shown below.

3. Click to open the link with the word "official", then enter your real name, ID number and mobile phone number, then receive and enter the verification code, and click Query. As shown below.

4. After clicking Query, the system will automatically send it to your mobile phone in the form of SMS. As shown below.

The reason why the mobile phone has no signal and no service:

1. The contact between the SIM card of the mobile phone and the elastic sheet of the mobile phone card slot is poor, resulting in the circuit of the SIM card not working, and the mobile phone cannot communicate with the network base station. You can reinstall the SIM card at this time.

2. The system software turns off the modem in the signal processing circuit of the mobile phone because the installed application software is incompatible with the system. At this time, the phone can be turned off and restarted, and the modem in the signal circuit of the phone will be restarted. After the signal is normal, the suspicious mobile phone application software installed before the problem occurs will be deleted.

3. The SIM card of the mobile phone is not registered in the network. You can use this SIM card on another mobile phone. If it also shows that there is no service, it is the reason for the SIM card.

4. Due to unexpected reasons, the mobile phone SIM card failed to reconnect to the search network after there was no signal in the network signal coverage area.

5. The reason why the signal coverage of the mobile phone SIM card network operator is not enough, at this time, you can change the location to an empty area and then check the display of the mobile phone signal grid. If the display is normal after changing the location, you can call the service phone of the network operator for feedback and complaints.