I would like to use Key with my Jolla smart phone, is it possible? Can I download Key app from other app store than Google Play? Seems that Google Play doesn't work with Jolla.
Unfortunately Jolla is a different Operating System than Android, so Google Play is not supported for Jolla either.
Currently F-Secure Key is supported in the following platforms:
Thank you for your interest in F-Secure Key.
It's not straight forward, but Google Play works on Jolla, see https://together.jolla.com/question/30926/howto-install-google-play/, and you may install Key from it.