Gates said he "prefers the more open nature of the Android ecosystem, as it's more 'flexible' about how software interfaces with the OS".

“I actually use an Android phone. Because I want to keep track of everything, I'll often play around with iPhones, but the one I carry around happens to be Android. Some of the Android manufacturers pre-install Microsoft software in a way that makes it easy for me. They're more flexible about how the software connects up with the operating system. So that's what I ended up getting used to. You know, a lot of my friends have iPhone so there's no purity."

In 2019, Gates admitted the way he handled Microsoft's own mobile phone division was his "greatest mistake". Microsoft ended up letting Google transform Android into the only true rival for iPhone. Microsoft missed out on a $400 billion market at the time, something Gates deeply regrets. In 2017, however, he went ahead and adopted an Android phone.