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Quick access to ringing tones control

Siemens C35i

Need to silent that ringing tone to a subtler beeping tone?
Hold down "*" for three seconds for quick access to "All tones switched off".
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

Siemens C35i

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 illumination".