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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
*The Game Is On*
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 😉