@Tina4
You have 2 options.
1 - transfer your contacts to your phone memory.
2 - put your sim in an iPhone and use the facility on that phone to write the number to your sim.
It's Settings >Phone >My Number.
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.
