hacker.house explains Russian police asked for an IMEI because it is stable and trackable via fake base stations or carrier networks, making it a durable identifier compared to IMSI randomization.
The Russian police asked for his IMEI as they can track this identifier with fake BTS or in network.
The IMEI does not change, unlike the IMSI which is randomized into a TMSI during authentication.
Once the IMEI is known, it's like a barcode for your life
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