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As you'd also expect from a youthful ecosystem, there's a few bugs — a brief attempt to get an Evernote client to work met with failure, for example, and the comments associated with apps are mainly listing problems them. Jolla has promised frequent updates to the OS, and the dedicated nature of native Jolla app builders does hopefully bode well for problems being ironed out quickly.
As I was testing the device without a SIM card, I've no indication of call quality. Listening to some music was decent enough though.
Nokia's Here maps are also onboard, and look lovely on the device...