1814
Today 10 years ago I got a Firefox OS phone
(jemmy.jeena.net)
This is a most excellent place for technology news and articles.
It's what killed Windows Phone. There was a period of about 6 seconds to get in on the commercial phone OS game, and it was long gone by the time Windows made a legitimate effort (Windows Mobile phones didn't really count - they were stuck with legacy PDA software).
Honestly, the AT&T exclusivity and the late rollout of the app store (iPhones initially only had the factory apps) were the opening that let Android in.