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..
Swapping Calls
To switch between callers, tap Swap..
Merging Calls
To merge two calls and create a conference call, tap Merge calls.. Note: The maximum number of callers on a call varies by carrier..
Ending a Call
Tap 
 to finish a call..
Adjusting Your Call Settings
You can open the call settings menu by tapping  | >  | > Settings..  | ||
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Fixed dialing numbers | Restrict outgoing calls to a fixed set of numbers.. To  | |||
do this you must know your SIM’s PIN2 code.. Not all  | ||||
  | carriers support this functionality..  | |||
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Quick responses  | Edit Quick response to rejected callers..  | |||
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Voicemail  | Select a voicemail service provider (your carrier  | |||
is the default), or edit the voicemail number if  | ||||
  | necessary..  | 
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  | Choose a TTY mode after connecting the TTY  | |||
TTY mode  | device to the phone’s headset port..  | |||
A TTY device can allow people who have  | ||||
  | hearing or speech disabilities to communicate  | |||
  | by telephone..  | 
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  | Turn on/off hearing aid compatibility.. When you  | |||
Hearing aids  | turn on the hearing aid compatibility and use a  | |||
hearing aid with a Telecoil to answer the phone,  | ||||
  | it will help you hear more clearly during the phone  | |||
  | call..  | 
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DTMF tones  | Set the length of   | |||
(DTMF) signal tones: Normal or Long..  | ||||
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Speed dial  | Set contacts as speed dials for keys   | |||
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14  | Phone Calls  | Phone Calls  | 15  |