@Sobiedobie
Safest way is when you get there but make sure to save the offer.
However, usually, just showing your phone with an O2 signal is sufficient.
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.
