So these are samsung galaxy s7 and s7 edge secret dialing menus, if you have samsung galaxy s7 or s7 edge you can try these dialing codes on your phone. Note: these secret codes might also works for the up coming galaxy s8.
To open the hidden menus, simply open phone dialing on galaxy s7 and then dial one of these codes to reveal the hidden menu.
Diagnostic and General settings mode
Check software version of phone
Check software and hardware information
Battery status (ADC, RSSI reading)
Factory data reset
Full factory reset (Don’t dial it does not ask you to confirm)
Quick test menu