I've heard that you may be able to release the PIN by putting in another sim with a Blackberry plan already attached to it. Then that person can log into their BIS admin page and add that device.
Then they can put their sim card back into their phone and log back into the BIS admin page to change the PIN back to their device.
Doing this should release the PIN. This should work for many carriers, but not all from what I understand.
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