In a blog post yesterday, Microsoft revealed they will make available Cortana for iOS and Android devices. Not only that, your Windows 10 PC will come with Cortana (subject to region and location) working alongside the phone counterpart.
Windows 10 will come with a phone companion app to help you setup Cortana and other prerequisite apps on your phone, from then onwards everything on your phone will magically appear on your PC.
Today, we’re announcing a Cortana application for Android phones and for iPhones which works as a companion to Cortana on your Windows 10 PC. The ‘Phone Companion’ app on the PC will help you install the Cortana app from the Google Play or Apple App Store onto your phone so you’ll be able to take the intelligence of Cortana with you, wherever you go.
See a video demonstration below.