Why there is no "cellular data" in iOS slide up menu?

I'm frustrated how many times I have to go to settings > mobile data to turn on mobile data. If it were in slide up menu I would use it definitely more often than "do not disturb" or "portrait orientation lock". I can't believe there was a user testing that proved uselessness of that button in slide up menu. It is on Android slide down menu, so why there is no such option on iOS? Does anybody know the reasonable explanation?