Here’s a step-by-step guide on how to do it.
1. Unlock your iPhone so you're viewing the home screen.
2. Hold down the power button to activate the ‘Slide to Power Off’ message.
3. Release the power button, then press the Home button for five seconds.
These steps will refresh your phone’s RAM, killing off processes that might be slowing your phone down.
Marc, who blogs about tech issues at marcforrest.com ,says: ‘I have done a number of tests to see if it works and I can promise it helps speed the phone up, a LOT!’