My puk code locked me out. Howevere I hadnt messed with it at all. What couldve causd

[AC Question]

However I never tried changing or ever even knew about it. How could that have happened

 

[Javier P]

Welcome to the forums. You can find the PUK code in the original frame that came with the SIM card. If you have lost it you need to get in touch with your carrier for assistance.