Samsung SM-A500F ユーザーズマニュアル

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Options during calls
During a voice call
The following actions are available:
•    : Increase the volume.
•  Add call: Dial a second call.
•  Keypad: Open the keypad.
•  End call: End the current call.
•  Speaker: Activate or deactivate the speakerphone. When using the speakerphone, speak 
into the microphone at the top of the device and keep the device away from your ears.
•  Mute: Turn off the microphone so that the other party cannot hear you.
•  Bluetooth: Switch to a Bluetooth headset if it is connected to the device.
Tap   to view more options.
When you launch apps during a call, a pop-up window for the call screen ( ) appears. You can 
continue your phone conversation while using apps.
To move the pop-up window, drag it to another location.
To delete the pop-up window, tap and hold it, and then tap 
OK.
To return to the call screen, tap the pop-up window.