Samsung SM-G930F - Manual (Page 123)

Applications
123
S Voice
Introduction
Perform various tasks simply by speaking.
Setting a wake-up command
You can launch S Voice using your own wake-up command.
When launching
S Voice for the first time, tap START and set your own wake-up command.
To change the wake-up command, open the Apps screen and tap Samsung → S Voice. Then,
tap → Voice wake-up → Change wake-up command → Custom → START, and then
follow the on-screen instructions.
To set the device to launch
S Voice using the wake-up command while the device is locked,
tap and tap the Wake up in secured lock switch to activate it.