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If you have set speed dial numbers long press the numeric keys
to dial the corresponding contact.
Press the Volume keys to adjust volume during the call.
Press and hold the 0 key during a call to enable Loud Speaker
mode. See Audio Settings for more information.
Press the Red key to hang-up (End) the call.
3.3
DTMF TONES DURING A CALL
When you are on a call if you press the number keys the DTMF
tones are sent to the network but you do not hear them in the
earpiece. This is to prevent interruption of the audio signal.
