The Nokia n900 was SO ahead of its time https://www.youtube.com/watch?v=o2LL6nVzTp8

Linux based smartphone! That felt great! Fold out keyboard! With GTK! Based on Debian!

I've still NEVER used a phone that felt as good as the n900 did

Nokia N900 Commercial

YouTube
@cwebber I really miss mine. The integration of all the different calling and messaging protocols in one coherent UI was second to none, but of course the walled garden operators like Skype, Google and Facebook don't want that.
@ilmari I still miss that from the Palm Pre, fully unified messaging, a feature ahead of it's time.