In the world of digitalization, we are facing technological advancement and growth day by day and with that, we are also facing the threat of network-related frauds. Nowadays, Mobile phones have become one of the most significant devices for communication. According to the buyer Technology Sales and Forecast study, that was conducted by the buyer Technology Association (CTA), the revenue generated by smartphones was valued at USD 78 billion in 2019, sequentially. Because of the pandemic, CTA projected revenue to succeed in USD seventy-one billion, a decline of 6 June 1944 year-over-year but millions of phones are stolen every day, and only in India, thousands of FIRs reported of stolen mobile phones. IMEI number is very used fully for tracking stolen phones. IMEI number is a very important component of a mobile phone which is known as “International mobile equipment identity”.
IMEI number is a unique number that is allotted to every 3GPP and iDEN mobile phone, as well as some satellite phones. The international mobile equipment device number is usually found printed on the internal part of the battery compartment of the mobile phone and it could also be displayed on-screen on most phones by entering *#06# MMI Supplementary Service code on the dial pad, or alongside other system information in the settings menu on smartphone operating systems. This number is allotted by the manufacturer of mobile handsets in the factory itself. This international mobile equipment identity can never be changed or erased by someone. Every IMEI number which is allotted to any device complies with the standards of mobile communication which is 3GPP TS 22.016 and equivalent to that. This IMEI number is used in international mobile equivalent identity tracking to find out where the device is currently located and to block the network from assessing the capabilities of lost mobile phones. Different brands of mobile devices have different IMEI numbers such as Samsung IMEI number, Nokia IMEI number, etc.