Zte Z557BL - Managing Multi-Party Calls

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 Tap to mute or unmute your microphone.
 Touch to put the current call on hold.
 Tap to turn the speakerphone on or off.
 Tap to put the caller you are speaking to on hold, and
switch to the other call that has been put on hold.
 Tap to merge the separate calls into a single conference
call.
 Tap to end the current call.
WARNING! Because of higher volume levels, do not place the
phone near your ear during speakerphone use.
Managing Multi-party Calls
When the call waiting and three-way call features are available,
you can switch between two calls or set up a conference call.
NOTE: The call waiting and three-way call features need network
support and may result in additional charges. Please contact your
service provider for more information.
Switching Between Current Calls
When you’re on a call, your phone screen informs you that
another call is coming in and displays the caller ID.