Google's monopolistic stranglehold on Android results in poor experience for power-users, and artificially restricts choice for those who have older phones. For example, Google Wallet is the de facto way to use NFC payments on Android. There's one problem though - it only works with Google's Android. If you have the temerity to install a 3rd party Android OS - like the hyper-secure GrapheneOS - …
Does it work for mainland EU?
I’m not seeing anything on regional restrictions, if anything their website makes it sound like they work globally (or I assume with anything that takes visa cards?)
It works in the entire European Economic Area (EEA).