Samsung SM-G960W User Manual page 71

Apps and features
Using earphones or a Bluetooth headset
Connect earphones or a Bluetooth headset to the device when your voice is not heard
clearly via the built-in microphone due to noisy environments. Press and hold the Call button
on earphones or a Bluetooth headset to launch Bixby Voice and say your request to the
microphone.
This feature may not be available or its method of use may vary depending on the
earphones and Bluetooth headset.
Call button
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