Cortana might well already be available across Microsoft’s own plaforms and Google’s Android OS, but the virtual assistant is only just now beginning to make its way out of private beta for iOS owners.
“In the spirit of the Windows Insider Program, we’re looking for a limited number of people to get their hands on an early version of the app. It’s important to keep in mind that this is the first public release of the Cortana for iOS beta. And that for now, Cortana for iOS is only available in the U.S. and China. Over the coming months, we’ll continue to deliver frequent updates to the app to expand the features and functionality”
For now, what that means is that there’s no deep integration between Cortana and iOS, so you can’t do things like say “Hey, Cortana” to activate the feature.