It's okay, not great. I use a second GPG key for the phone so as to reduce the number of passwords accessible there. While it works out of the box, getting it to work nicely needed a bit of plumbing[0].
Moreover, there isn't any support for Yubikey or smartcards.
Moreover, there isn't any support for Yubikey or smartcards.
[0]: https://captnemo.in/blog/2020/01/04/security-setup/#mobile-p...