Samsung SGH-D415MSATMB - Manual (Page 58)

Options During a Call
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2. Press the Down key to highlight the Mute option.
3. Press the OK soft key.
The other person can no longer hear you.
To switch the microphone back on:
1. Press the Options soft key.
2. If necessary, press the Down key to highlight the
Unmute option.
3. Press the OK soft key.
The other person can hear you again.
Muting or Sending Key Tones
These options allow you to turn the key tones off or on. If the
Mute Keys option is selected, your phone does not transmit
the DTMF (Dual Tone Multi-Frequency) tones of the keys,
which allows you to press keys without hearing annoying key
tones during a call.
Note: To communicate with answering machines or computerized
telephone systems, the Send Keys option must be selected.
Sending a Sequence of DTMF Tones
You can send the DTMF tones after entering the entire
number you need to send.
This option is helpful for entering a password or an account
number when you call an automated system, like a banking
service.
To send the DTMF tones:
1. When you are connected to the teleservice system, press
the Options soft key.