Use an On Screen Home Button

The iPhone home button is one of the first parts to wear out for many users, and others find it too noisy to use in meetings or while next to someone in bed.

Put a home button on the iPhone screen.

Apple includes a way to place an on-screen home button on the iPhone 5 home screen. Users can put the home button anywhere on the screen and use it inside of any app.
To turn this on go to Settings -> General -> Accessibility -> AssistiveTouch -> On.
It’s also a good idea to set a home button triple click to toggle this setting so it’s easy to hide the on-screen home button. Once setup, users can tap this button to access the home button, Siri, and to change other device functions.