Samsung SM-A920F User Manual page 70

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 and say your request to the microphone.
Call button
Deactivating Bixby
You can deactivate Bixby from launching even when you press and hold the Bixby key or say
"Hi Bixby".
On the Bixby Home screen, tap → Settings and tap the Bixby Voice switch to deactivate it.
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