Operating systems supported by the "one" app
iOS 9.x and above
Android 5.0.x and above (Mobile Pay as from Android Version 6)
Browsers supported by the "one" online portal
"one" supports the latest versions of the following web browsers: Google Chrome, Mozilla Firefox, Microsoft Edge (only Windows), Microsoft Internet Explorer (only Windows) and Apple Safari (only Mac OS). There are likely to be limitations if you are using older versions of these browsers.
Microsoft Internet Explorer