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Hidden pieces of code have been a part of computer software for decades. Referred to as easter eggs, they show up when a specific (and usually undocumented) set of commands is given – in Android, for example, tapping several times on the device's firmware version displays a secret screen. What we're about to go over, however, is not an easter egg. It is a hidden menu found on Samsung Galaxy smartphones and it can be used for checking whether the device is in good working order...

Hidden pieces of code have been a part of computer software for decades. Referred to as easter eggs, they show up when a specific (and usually undocumented) set of commands is given – in Android, for example, tapping several times on the device's firmware version displays a secret screen. What we're about to go over, however, is not an easter egg. It is a hidden menu found on Samsung Galaxy smartphones and it can be used for checking whether the device is in good working order...