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There is also S40 platform powering Nokia Asha pseudo-smartphones. S40 is not Symbian, it is a distinct OS.

Various pre-smartphone Japanese phone OSes, e.g. I think au had one called "KCP", which was based on "BREW" from Qualcomm... BREW was apparently used in various forms by others too.

> Anything else I omitted?

* Meego, Maemo, Mer (or did you count them under SailfishOS or Tizen?)

* Openmoko