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Hi @Anonymous As @Beenherebefore states
Go to my O2 here http://www.o2.co.uk/myo2
And check this section
If you click on Find out more....your PUK number will be displayed in there
Veritas Numquam Perit
Other options are here...
... or call customer service or use live chat.
I have my PUK saved as a phone number in my contacts, it's always the same number unless you change sim cards. Proved to be a good option one drunken night 😉