Maybe a phone without IMEI?

Question

Information Security

My phone after the firmware gives out "incorrect IMEI" when asked to show imei. Two operators work and the third displays "Incorrect IMEI". We all know that by changing the SIM card, they can still trace it by IMEI (I'm just "paranoid" and a little interested in this). Does this mean that after the firmware, IMEI flew out of the phone and the first two operators will not be able to trace it?

Answer 1

usually the IMEI is written in nvram and yes - it can be changed, only if the police stop you and they have the right to confiscate the communication device as substandard.
www.gsmforum.ru/threads/10887vrtp.ru/index.php?showtopic=21312
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Answer 2

Just a guess. When flashing, have it reset to the one that the third operator has blocked. It needs to be restored to what it was.

Answer 3

maybe there is no display, but it is transmitted anyway