I believe it's actually because iOS9 automatically prefers IPv6 to IPv4: http://thenextweb.com/apple/2015/07/11/os-x-10-11-and-ios-9-now-prefer-ipv6-for-connect

I believe it's actually because iOS9 automatically prefers IPv6 to IPv4: http://thenextweb.com/apple/2015/07/11/os-x-10-11-and-ios-9-now-prefer-ipv6-for-connections/ http://thenextweb.com/apple/2015/07/11/os-x-10-11-and-ios-9-... I actually highly doubt the majority of iOS9 users even know what IPv6 is, let alone if they're using it or not. Your explanation is also flawed, iOS adoption does not follow other software. It's already got a ridiculous number of users: http://www.digitaltrends.com/mobile/ios-9-adoption-rate-day-1-news/ http://www.digitaltrends.com/mobile/ios-9-adoption-rate-day-... and Apple is even more in your face with this update than past ones; there's a few regular popups, and they even let you schedule it for the night when you aren't using your phone.