You can disable the “Hey Siri” and Voice Control features on your iPhone to prevent others from being able to control your device with their voice. Here’s how:
- Go to Settings and tap on “General”
- Scroll down and tap on “Accessibility”
- Tap on “Voice Control” and set it to “Off”
- Tap on “Hey Siri” and set it to “Off”
- Reboot your iPhone
Now neither “Hey Siri” nor Voice Control will be able to activate on your device. Note that you will need to turn these features back on if you want to use them again.