most modern devices with a single sim slot have 2 IMEIs (one that is built into the device on the device board) and the other one is for the user to use (insert/eject).new_user wroteIf I am not mistaken only dual sim devices have 2 IMEIs.
the one built into the device is a modern technology used to market the usage of eSIMs instead of the regular simcards we know.
eSIM is a virtual card, your phone doesn't need to have a SIM card in order for this to work.
eSIM technology is not only limited to mobile devices but also Laptops and Smart Watches.
IMEI fingerprints are used to identify devices on a telecom level, the provider needs to categorize the usage of the communication (transmission of data) being made from and into your device, whether it is sent over eSIM (the one built internally) or using the regular SIM card.
Mostly, IMEIs are registered in order to keep track of people's identities and to prevent terrorism or any illegal act.