Service menu

Android phones

on newer Android devices:

*#*#7378423#*#*

Jog Dial phones

for devices which have a Jog Dial:

Jog Dial Up, Asterisk, Jog Dial Down, Jog Dial Down, Asterisk, Jog Dial Down, Asterisk

Navigation Key phones

for devices which have a Navigation Key:

Right, Asterisk, Left, Left, Asterisk, Left, Asterisk