From whatswithjeff.com: "Every phone has its little secrets. A hidden feature, just there hidden and waiting for the right access code to be entered, and the Samsung Galaxy Note 2 is not exempted from this. I recently discovered that the Galaxy Note 2 has a hidden menu, a diagnostic tool to be exact to check the status of the phone. It’s an all in one diagnostic tool to check the condition of the Galaxy Note 2. It doesn’t need any rooting nor the need the phone to be connected to a computer. All you need is an access code." (Gadgets, Samsung Galaxy Note 2)