To close the application on iPhone without a Home button (X or later):
- Swipe up from the bottom of the screen and pause in the middle of the screen.
- Swipe up on the app's preview to close the app.
To close the app on iPhone with a Home button and iPod Touch:
- Double-click the Home button to show your most recently used apps.
- Swipe up on the app's preview to close the app.