@Andyandra
Try a network reset or manually update your apn for O2.
If still not working, you may need a new sim which you can get from any O2 store. Take photo ID with you.
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.
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