overseas postal code doesn't work

[MulanMulan]

I can't use top up with an overseas card and billing postal code?  

[MI5]

@MulanMulan 

You must use a UK card or other online top up method Guide How to Top Up (PAYG) 

*Mobile top up alternative. (Helpful when abroad/struggling with UK based cards)

You can easily purchase O2 top up online via MobileTopup.co.uk and top up your O2 mobile within 1 minute. You select the O2 top up amount, then you check the order and you pay the phone credit using one of the secure payment methods. After payment, you will receive the top up voucher code via email. You can then directly top up your O2 Pay as you Go Plan using the instructions given

http://www.mobiletopup.co.uk/o2

[Marjo]

Hi there @MulanMulan , I hope you're having a good Friday and you got all the information you needed from @MI5  above! Don't hesitate to come back to let us know if you have any additional questions.