response: Oh yeah, it's iOS.  It's a mobile operating system.
original_response: I like that they run the iOS operating system.
history: Heyy, what do you think of Apple! I've owned an iphone my whole life and I'm not sure if I'll always want to own one. Hmm well I don't have an opinion to offer, sorry.  I do know that Apple Inc. is the company that designs and markets iPhones. Yeah, I knew that!  Oh do you know what operating system they use?
knowledge: They run Apple's iOS mobile operating system.