Try to hard reset it
The lockout code is generated by your Phone's serial number and is meant to keep you from putting your own sim cards in. So I would put the original SIM card in.
When you get locked out from bad PIN inputs and are asked for the PUK code, you get REALLY locked out if you get that one wrong. At which point your best option is to call your carrier for the PUK2 code so they can help you unlock your phone.
The alternatives are illegal and I can't post them.
SOURCE: palm treo 750 locked sim card need puk code to unlock
anyone know how to unlock them for free? or know the code to do it?
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