Topping up a dual-sim US phone registered to O2 in the UK

[Pete_H]

Hi. I'm visiting family in the UK, and so bought an O2 sim. It works fine in my international Samsung A51, I received the O2 2FA text, registered it on their site...   but their site won't accept a US billing address for a credit card, so I can't top it up. Weird; everywhere else does. Is there any other way to pay to top it up? Cash, paypal etc.? Thanks for any help!

[jonsie · Accepted solution]

Help here

Guide How to Top Up (PAYG) 

[Pete_H]

After a bit more research it seems I just need to find somewhere that sells a top-up voucher. Hopefully that'll do the trick...

[jonsie]

It will @Pete_H 

Most newsagents and supermarkets sell vouchers