Quick access to ringing tones control
Need to silent that ringing tone to a subtler beeping tone?
Hold down "*" for three seconds for quick access to "All tones switched
Or if you're in a noisier environment and need a more audible sound, hold
down the same button for three seconds to have "All tones switched on".
Instant screen illumination when keypad is locked
Need to search for a number in a hurry in a dark room but also remembered
that you switched off the screen illumination function?
Press and hold the red "End Call" button for a few seconds to get "instant