I love the concept of the Core, because I often leave my phone at home. Unfortunately it requires a country whith a mature and affordable mobile internet infrastructure, neither of which applies to Germany.
> You can also use Core’s 4GB of built-in storage to access your favorite playlists, podcasts, and audiobooks.
> Core also works without a SIM card or cellular plan, using WiFi to sync offline music and workouts.
Another useful use case would be an emergency button for elderly people. Current devices are rather expensive and/or only work at home.
I didn't find Germany's mobile internet too expensive, I was quite happy with Congstar prepaid when I was last over there. Certainly comparable with Australian mobile internet pricing. On the other hand, Australia now has free mobile Spotify streaming (on Optus), not sure if Congstar does.