Hi @Anonymous
See help here please https://www.o2.co.uk/help/phones-sims-and-devices/activating-your-sim
If this is an upgrade though, you can use your old sim as the account details would have been changed online so your old sim will have the new upgraded account on it.
If it's the wrong size you need to do a sim swap http://swapmysim.o2.co.uk/
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.
.gif)
