Nokia N9 and its OS: Meego. Imho this was in so many aspects "UX just done right".
I wrote a post about the alarm clock[1] a while ago, which I feel is pretty indicative of the thought that went into each feature.
Too bad about the rare bug that never got fixed that could show a received SMS under the wrong contact. Or the bug (which did finally get fixed by the community) where if you received an SMS with emoji in it, it would silently just never show the whole message at all!
[1] http://nition.momentstudio.co.nz/2014/08/the-nokia-n9-alarm-...
(I might say one of the issues with lack of focus was relying too much on desktop linux components, as Android went down a different path, but that's a discussion for another time)