@Elliot21
Follow the guide here Guide: Unlocking an O2 phone to use a different SIM card
The phone needs to be active on the network so you need to have an O2 sim in it.
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.
