The original HTC Incredible. Comparatively speaking, it was a very modern looking phone. The back was the thing that people noticed. It had a weirdly shaped battery cover back. The physical interface was pretty great and it included an optical cursor or whatever you want to call it.
modern phone gripe
It could be operated with one hand whether you've got big hands or small hands. I hate the fact that everything now is available only in phablet and bigger phablet.
And without user swappable batteries. Ugh.
That was a cool thing I had no idea even existed until I saw the video. It kind of makes me wonder what other engineering realities that are a part of our daily lives that I just have no clue about whatsoever. Thanks for sharing!