Pac code
Re: Pac code
@angelika Please see this link: https://community.o2.co.uk/t5/How-to-Guides/How-to-get-your-PAC-2017-Update/ba-p/1052278
Edit: Depending on how old your phone is, you may also need to get it unlocked to be able to use it on another network: https://community.o2.co.uk/t5/How-to-Guides/Unlocking-an-O2-phone-to-use-a-different-SIM-card/ba-p/1...
Just to let you know that you aren't speaking to customer service here on the community.
Hi @angelika, just wanted to ask if you got all the information you needed from the above advice and if you have any additional questions? 
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