Mobile Machine Interface (MMI) codes represent a set of characters, typically starting with or #, used to access hidden settings and functionalities on mobile devices using the Android operating system. These codes enable users to interact directly with the phone’s modem and network configuration. An example is the code #06#, which displays the device’s IMEI number.
The significance of these codes lies in their capacity to unlock diagnostic tools, reveal device information, and modify certain network parameters, providing advanced users with enhanced control. Historically, such codes offered a bridge between the user and the underlying hardware, bypassing standard user interfaces. Their use can enable quick access to vital information or configuration options that are not readily available through the typical settings menu.