From Here:
Building to a Device
After you have Ionic installed, we can build our app to a physical device. If you don’t have a physical device on hand, you can still build to a device emulator. Check out the iOS simulator docs if you are on Mac, or the Genymotion docs if you are looking to emulate an Android device. We will also need Cordova to run your app on a native device. To install Cordova, run:
404 on iOS simulator, Genymotion and Cordova