09-12-2023 07:50
09-12-2023 08:02
Try the web version in a browser, @Olivia2023 - https://accounts.o2.co.uk/signin
The app can be touchy, requiring the app to be uninstalled, the phone rebooted, and a reinstall (or clear the app's cache and storage completely and re-enter your login details).
If no joy, and you need info urgently, say bill detail, then contact O2 on Social Media via the link just below. Good luck!