These numerical or symbolic sequences, when entered into the device’s dialer, unlock hidden menus and diagnostic tools. For example, a specific sequence might reveal the phone’s IMEI number, access testing features, or reset the device to its factory settings.
Accessing these hidden functionalities can prove invaluable for troubleshooting, customizing device settings beyond the standard interface, and gaining deeper insights into its operations. Historically, these sequences were primarily intended for manufacturer use during development and testing, but some have become widely known and utilized by end-users.