Crossword Genius

What some smartphones run on (3)

Ross

I believe the answer is:

ios

'what some smartphones run on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ios that I've seen before include "Apple's mobile system, in short" , "Another Greek island" , "Greek island and mobile phone system" , "place?" , "Greek isle" .)

I've seen this clue in The New York Times.
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