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Iridium 9555- What does Error message PIN 2 Blocked mean on my Iridium 9555?

This article describes when an iridium 9555 displays the error message PIN 2 Blocked.
Message Received:

PIN 2 Blocked

When the PIN2 number has been entered incorrectly three times in a row, the phone will automatically block the PIN. To unblock the PIN2 enter the PUK2 code for the phone by entering **052* from the main screen.