Only ones who know is that persons Service Provider since its their SIM. The default PIN is from the SP and the User can change it on their own. The PUK would come from the SP based on the ICCID or serial number of the SIM to unblock it. If they cannot provide it, then they (the User) would need to get a new SIM from the SP and start all over. Shouldn't be any trouble for the User to get a new one from their SP since they are paying them for the service.
If the User gets a new SIM and the phone asks for the PIN, then the phone is the one that needs to be factory reset to disable the PIN Check which is set to Off by default. It should also reset the Security Code to the Default one listed in the User Guide as well.
If you feel that you have to correct some of my posts for my capitalization of some of my words, then just bear with it. It's just a discussion forum where some may be limited by time to answer in well-versed and eloquent sentences.
I already got a PHD (Plain High School Diploma) so ignore my style of writing and I'll ignore your ignorance.
Subject: You can read this-trust me!
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdgnieg. The phaonmneal pweor of the hmuan mnid. Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it wouthit a porbelm.
Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Amzanig huh? yaeh and I awlyas thought slpeling was ipmorantt!
When asked if I see the glass half empty or half full, I responded I see just a glass of water.
Now you know how I think.