You can top-up your TPO SIM online with your UK account whilst outside the UK, provided that you are in Europe or in the US.
You'll need to top-up by going online to our Top Up page.
If you are going to another country, we advise to top-up before you leave as we cannot guarantee that your card payment will go through.
Please be aware that you need to contact us before leaving the UK if you wish to use your TPO phone abroad, as the International Romaing Service is suspended by default.
This article explains how to ask us to authorise your SIM to be used when you are abroad.