Apple’s company line has been that with iOS’s excellent memory management, there is no reason for users to quit apps or restart to clear off memory that causes slow down. In reality we all know iPhone tends to slow down after a while. Restarting your device is not the only way to make it run smoothly again. Here’s a simpler trick:
1. Unlock your iOS device. This trick will not work when you’re on lock screen.
2. Press and hold the power button until the “Slide to Power Off” bar appears.
3. Press and hold the home button until your phone is back to the home screen.
That’s all. Your iPhone’s memory is now refreshed.