1809 is ok, possibly even good enough to be launched in it's own right but how do you launch a mobile os with no supporting hardware available?
Also you commented that tech is a 'linear process' i do not think that word means what you think it means, tech is adopted as a series of unpredictable step changes, moores law is no longer applicable and only applied to microprocessors as an intel marketing point, iPhone was an anomaly and little has changed since