First, click "Settings" on the desktop of iPhone 7.
2. After entering the setting interface, find the "Siri and Search" column in the drop-down menu, and then click Enter.
3. Turn on the switches of "Wake up with" Hey Siri ","Press the home button to use Siri "and" Allow Siri when locked ".
Fourth, you can use the Siri function.
Precautions:
1, Siri voice assistant can be turned on by default when iPhone locks the screen.
2. After starting Siri, there will be a prompt above the microphone icon "Hello, what can I do for you?" Then you can say the command. Before you say the command for the second time, you need to click the microphone logo at the bottom before you say the command.