This reply
woof! mark this message contains personal perspective
originally written by woof!
IMEI大致上是每台裝置獨立,支援多個SIM的手機則可能有對應的多個IMEI。依手機設計來說*#06#不一定可以查到IMEI,但操作系統內,手機上或內部標籤以及外盒上多半也會有記載該手機之IMEI。

使用上來說曾有執法機關依靠IMEI來追蹤和逮捕嫌犯,也有特定行動服務運營商被偷竊的手機IMEI不提供服務。
但另一方面來說,這種方式必須依靠該地區執法機關/運營商/製造商而定,而且IMEI依手機設計來說也不是沒可能被竄改。
購買二手手機時也可以試著查詢該機使否為贓物。

建議使用者可以記錄下自己手機的IMEI備用,但是執法機關/運營商/製造商未必會讓人追蹤特定IMEI。

Opinion Sources

https://en.wikipedia.org/wiki/International_Mobile_Equipment_Identity
https://www.abc.net.au/news/2023-06-04/bali-bombers-caught-with-australian-intelligence-involvement/102362158

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