October 2017
To close an app on iOS: https://support.apple.com/en-us/HT201330
1.Double-click the Home button to show your most recently used apps.
2. Swipe right or left to find the app that you want to close.
3. Swipe up on the app's preview to close the app.
To close an app on Android:
1. Tap the Overview button.
2. Scroll through the apps.
3. Drag the app off the screen.