No access to my SIM card and I need a PUK code

[HTSC]

I'm getting a message saying I can't access my SIM card and I need a PUK code. This has randomly started. Please help me - how do I get a PUK and why has it suddenly started asking for this?

[TallTrees]

Hi @HTSC 

Information here

Guide: What code do I need: PAC or PUK 

[HTSC]

I need a PUK code. I can't make a phone call and all "the agents are busy". How do I get a PUK code?

Many thanks

[TallTrees]

Hello @HTSC 

Read here 

PUK here https://www.o2.co.uk/help/phones-sims-and-devices/unblock-your-phone