How to Hard Reset an iPhone
1. Press and hold the Home button (big circle below the screen) and the Sleep/Wake button (on top of the iPhone) simultaneously
2. Continue holding both buttons until the iPhone shuts off and begins to restart. This will take anywhere from 10-20 seconds.
3. You may let go when you see the silver Apple logo. You have now completed the soft reset successfully.
4. Don’t be alarmed that it takes quite a while to load from the Apple logo to the main screen. This is normal.