@Enes1
You can try the different ways here Guide How to Top Up (PAYG)
Note, to do it online with O2 directly, you need a UK bank card only, so using a voucher might be the best way for 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.
