The iPhone can get sluggish and laggy after a while. iOS doesn’t have a button to you can tap to shutdown all apps and free the RAM.
But there’s a quick trick to force your iPhone to free up it’s RAM without a new app to download.
- Hold the Sleep / Wake button until you get the “slide to power off” screen.
- Release the the Sleep Wake Button.
- Now hold the Home button until it goes back to the home screen.
Once the iOS home screen is displayed, the iPhone’s RAM flush should be completed.