on 29-12-2020 14:09
What error message do you get?
And are you using a Revolut issued card from either Mastercard or Visa, as some cards dont have UK BIN's (first six digits of the card number).
I also have a Planet Computers Gemini
I work in IT as an Enterprise Messaging and Collaboration Tools Administrator (Office 365, Slack and much much more) and manage hardware both Mobile and Desktop / laptop, my desk is a bit like PC World
We are all customers and dont have access to any o2 accounts
on 29-12-2020 14:10
See all ways to top up here Guide How to Top Up (PAYG)
You may need to use an alternative method.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)