There are many “hidden functions” in the iPhone.
Here is an example that can be used when you only have one hand free to hold your phone.
Enable Motion Sensing Controls in iOS 7 Apple’s mobile phone using iOS 7 lets you launch Siri or press the Home button by simply tilting your head, or pull down Notification Center by tilting your head to the left.
Go to; Settings > General > Accessibility > Switch Control to turn it on. Now go to Switches and set up switches to perform different actions.
(Tip from iPhone Life Newsletter)