Mobile phone serial number means that every mobile phone has a unique identity number when it leaves the factory. It is unique and can verify the authenticity of the mobile phone, but the serial number cannot be changed, and there is no function that makes the mobile phone unusable.

If the serial number of the mobile phone is reported lost or cancelled, then the mobile phone cannot be used. The mobile phone serial number can display the information of your mobile phone, which is equivalent to the mobile phone ID card. For smart phones, you can make a mobile phone certificate through the serial number of the mobile phone, sign the software used for the mobile phone, and then install it, but only some software will do this.

Extended data:

IMEI (International Mobile Equipment Identity) code, commonly known as "mobile phone serial number", is stored in EEPROM (commonly known as chip) of mobile phone, and each mobile device has a unique IMEI. Its composition structure is TAC(6 bits) +FAC (2 bits) +SNR(6 bits) +SP (1 bit).

Imei (International Mobile Equipment Identification Code) is the abbreviation of international mobile equipment identification code, which is an "electronic serial number" composed of 15 digits, corresponding to each mobile phone one by one, and the code is unique in the world. Every mobile phone will be given a unique group number in the world after assembly, and this number will be recorded by the manufacturer from production to factory.

References:

Baidu Encyclopedia-Serial Number