If you enter the PUK code incorrectly 10 times, your SIM card will be permanently blocked and destroyed. You will need to purchase a new SIM and request a number transfer.
If you have never changed your PIN, you can find the default code on the plastic card your SIM was originally attached to. If you have changed it and forgotten the new code, . What Happens if You Block Your PIN?
Have you ever locked yourself out of your SIM? Did you find your PUK code easily, or did you have to call support? Let us know in the comments below!