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I could say the same thing with longer words if you like. e.g. "the carrier transmits a unique cryptographically signed message to the phone that it uses to change the configuration of the cellular baseband modem to remove the SIM lock".
(I'm a bit unclear on the exact technical details of how exactly the message gets to the phone and whether it's the carrier or Apple that does the cryptographic signing, and so on, but you get the idea)
grams
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