1.Press 
and then tap 
> Settings > My device.
2.Tap Call, and then tap Turn off screen during calls to enable or disable the setting.
Call Alerts
Set options for sounds and vibrations to occur during calls.1.Press 
and then tap 
> Settings > My device.
Vibrate on connection to network: When enabled, your phone will vibrate when a call connects to the network.
Call connect tone: When enabled, the phone plays a tone when the other caller answers a call.
Minute minder: When enabled, a tone plays once per minute during a call.Call end tone: When enabled, the device plays a tone when the other caller ends the call.
Alerts on call: When enabled, notifications for alarms and new messages play during calls. When disabled, these notifications will be muted during a call.
Call Accessories
Configure options for using a headset for calling.1.Press 
and then tap 
> Settings > My device.
Automatic answering: When enabled, and you have a headset connected to the Headset Jack, incoming calls are answered automatically after a delay, which you can set at Automatic answering timer. Tap to enable or disable the setting.
Automatic answering timer: Choose a time period to delay before automatically answering an incoming call when Automatic answering is enabled and a headset is connected to the device. Tap to choose 2 seconds, 5 seconds, or 10 seconds.
Outgoing call conditions: When the device is paired with a Bluetooth headset, you can choose to make calls even when the device is locked. Tap to choose Even when device locked, or Only when device unlocked.
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