@SimforiPhones
Your phone may be locked to another network.
You will need whichever network to unlock it for you.
You can find out here https://www.checkmend.com/uk/ or just try different network sim cards until you find one that works.
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.
