Nokia N9 still has the most modern and refined user interface, 15 years after being discontinued:

https://www.youtube.com/watch?v=iCFNXhiFnKY

And they dropped this for that unfinished mess that was Windows Phone. I still don't understand what they were thinking at Nokia.

But it really was a once in a lifetime experimental device. The aesthetics were a little whack, in an endearing sort of way.