@Eg99_
It's a chargeable call so will be prevented by a spend cap Guide: Spend Caps & Charge to Mobile on O2
You can use a website to find an alternate number that is free to call https://www.saynoto0870.com/
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.
