AT&T Z831 User Manual page 28

Muting a Call
During a call, you can mute your microphone so that the person you are
speaking to cannot hear you, but you can still hear them.
Tap Mute to turn your microphone off. To turn your microphone back
on, tap Mute again.
Putting a Call on Hold
During a call, you can put it on hold by tapping Hold.
Tip: If you accept an incoming call while you re on another call, the
first call automatically goes on hold. Tap Swap to switch between the
two callers.
Turning the Speakerphone On/Off
Tap Speaker during a call to turn the speakerphone on. Tap Speaker again
to turn off the speakerphone.
Adding a Call
During a call, tap Add call and dial a number. When you call another
number, the first call automatically goes on hold.
28 Phone Calls