HTC One User Manual page 220

220 Travel and maps
Handling incoming calls in HTC Car
When you receive an incoming call, you can easily answer or decline.
If you hear a voice prompt, say "yes" or "no" to answer or decline a
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call.
Tap Answer or Decline.
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Making phone calls in HTC Car
Tap Dialer to open the dialpad.
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Tap People and then browse a category or search by entering a
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name.
Tap Speak and say "Call" and the person's name. For example, say
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"Call Jennifer Singer".
Customizing HTC Car
To change the default behavior of HTC Car, tap Settings.
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To add more apps to HTC Car, tap
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and select an app.