ZTE A462 / Telstra Smart Plus - Manual (Page 21)

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End a call
Touch the button to hang up the call.
Adjust the volume
In a call, you can raise or lower the volume by using the volume keys.
Turn the speaker on or off
In a call, touch the button to turn on the speaker, and touch it again to turn off
speaker.
Add a multi party or Conference call
In a call, touch for Options then Add call. Dial a number and touch the phone icon to
add one call and put the current caller on hold. Press Options > Merge to join the two (or
more) parties together.
Use touch tones during a call for automated call systems