Mobile Machine Interface codes are special character sequences, typically starting with a or # symbol, that are entered into a mobile phone’s dialer. They instruct the device to perform specific actions beyond simply placing a call. A common example is #06#, which displays the device’s IMEI number.
These codes provide access to hidden menus, diagnostic tools, and configuration settings that are not normally accessible through the standard user interface. Historically, they have been crucial for technicians troubleshooting network issues and customizing device behavior. They allow for quick access to information and functionality without navigating complex menu structures.