Dial by voice
To place a phone call by speaking, use the Voice Dialer app 
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If you have a BlueTooth headset that supports voice dialing, it may work with Voice Dialer. For details, see the documentation that came with your headset.
To make a phone call with Voice Dialer:
1Touch the Voice Dialer icon 
on a Home or All Apps screen.
The Voice Dialer opens, listening for your spoken instructions, and displaying some hints for how to use it.
2Say “Call” followed by the name of the contact to call. Or follow one of the other Voice Dialer suggestions:
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