IMEInummers

IMEI numbers are globally unique identifiers assigned to mobile equipment by manufacturers. They enable cellular networks to identify a specific device and are used for purposes such as network authentication, fraud prevention, device tracking, and blocking lost or stolen devices. The standard IMEI is typically a 15-digit decimal number structured as TAC-SNR-CD, where TAC is an eight-digit Type Allocation Code identifying the device model, SNR is a six-digit serial number distinguishing individual devices, and CD is a one-digit check digit calculated with the Luhn algorithm.

The IMEI is usually printed on the device, on the packaging, and on the battery compartment. It can also be retrieved on most devices by dialing the code *#06# or by inspecting settings or system information. In many countries and by many operators, IMEI data are recorded in national or operator databases and can be used to blacklist devices reported as stolen or lost, thereby preventing continued use on networks.

Privacy and security concerns accompany the use of IMEI data because the number serves as a persistent identifier tied to a physical device. Operators and manufacturers rely on IMEI information for network security, inventory management, service provisioning, and warranty support, which has led to discussions about user privacy and data protection.

Regulation and governance of IMEI allocation, validation, and usage are coordinated by industry bodies such as the GSMA and 3GPP, which maintain standards and reference databases. Many jurisdictions also regulate the handling of IMEI data and prohibit altering or disguising an IMEI, reflecting its role in network integrity and anti-fraud efforts.