Unlocking hidden Android capabilities with secret dialer codes Android's secret codes operate through what's technically called Man Machine Interface (MMI) codes. These specialized command ...

There are also what are called Man Machine Interface (MMI) codes, which phone manufacturers make specifically ... you can change this number by going to Settings > Phone > Call Forwarding. On Android ...

So to solve the Connection Problem or Invalid MMI Code issue, let’s reboot in safe mode. To reboot in safe mode or enter safe mode, follow these steps: Turn off your device. Press and hold the ...

These codes are enclosed between the * and # characters and are known as Unstructured Supplementary Service Data (USSD) codes when they access services supplied by the mobile operator, or MMI (Man ...