For example, 8986 00 60 26 07 4 5622354, 8986 stands for China, 00 stands for operator China Mobile, and 79 stands for the third and fourth digits of mobile phone number. In this case, 1360 26 represents the issuing province number, 07 represents the issuing year in 2007, 4 represents the manufacturer, and 5622354 represents the user identification number.
2. Description of the 20 digits behind the SIM card of China Unicom:
For example: 89860170029 530981s, 8986 stands for China, 0/kloc-0 stands for China Unicom, 07 stands for the year of card issuance in 2007 (system), and 05 stands for the third and fourth digits of mobile phone number, so the card is130.
Extended data:
The power supply of SIM card can be divided into 5V (issued before 5V (1998)), 5V compatible with 3V, 3V, 1.8V and so on. Of course, these cards must be used with the corresponding mobile phones, that is, the power supply voltage of the SIM card generated by the mobile phone matches the voltage required by the SIM card. After the SIM card is inserted into the mobile phone, the power port supplies power for each module in the SIM card.
The signal used to detect the presence of the SIM card is only generated at the moment of startup. When the SIM card is not detected at startup, it will prompt "Insert SIM card"; If the SIM card is detected, but communication between the machine and the card cannot be realized, "Check SIM card" will be displayed.
When the SIM card does not respond to the power-on detection signal, the mobile phone will also prompt "Insert SIM card"; When the SIM card falls out during the startup process, the contact is poor due to looseness, or the discarded card is used, the mobile phone will prompt "SIM card error".
Baidu encyclopedia -SIM card