Um-m-m-m. Yes. Before it became iOS, it was called iPhoneOS. When the iPad came out, it was renamed iOS. iOS was never called OS X 10.5. Now, Apple did say that iPhoneOS had OS X as its base (or that the original iPhone ran a version of OS X), and also said Mac OS X had OS X as its base (before Mac OS X became OS X) https://en.wikipedia.org/wiki/History_of_iOS There are many many many references for this (iPhoneOS).
6/17/15 at 8:02pm