in that case, its symbian, not S60, as its the version nokia uses (specifically its symbian with a interface made to match nokias older phone firmware, known as S40).

motorola and sonyericsson used a different interface on top of symbain, uiq. tho the latter folded ones nokia grabbed the symbian shares and started setting up the symbian foundation.

still, if you swap OS for platform, you may well be correct, tho i am still not sure about S60, as a platform, being a flop, given how many nokia phones there are out there running it.

btw, here is a list of gsm phones running symbian S60...