@Craig10
A PAC is for switching networks.
To activate a new sim on O2 you need to do a sim swap Guide: Sim Swap: a mini guide 2017 update or call 4445 for customer services.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.