What is Nokia’s innovation?
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Well, just as innovative, maybe not famous, like the first slider or the first phone for two sims. But at the time they made very successful, balanced on the set of functions and convenient phones.
There were a lot of cool smartphones for its time (it was when WM 6.5 dominated, before iPhones) with a symbian, which, as your Linux, could be modified and reworked as you like, and which was not too dim and dumb as an Android.
But the most memorable were the simple "callers", which were simple and primitive, but very convenient to use, always worked and kept the charge up to one and a half weeks without recharge. And served for years. The same kind and the same cheap Siemens, motorol and others, were just cheap, not simple, and for a few months of constant use, especially if you constantly wheel around the city in any weather, pull all the belt on the country, etc., wiped and dissolved into dust, glued and cut.
But then Nokia started a mess with its own OS, it scared customers, and everything went wrong.