To turn off an iPhone 12, press and hold the side button along with either the volume up or volume down button simultaneously until the power-off slider appears on the screen. Then, slide to power off your iPhone. Alternatively, you can turn it off via Settings by going to General, then selecting Shut Down, and sliding to power off. You can also ask Siri to turn off the iPhone if Siri is enabled. Detailed methods:
- Press and hold the side button and either volume button for a few seconds until the power-off slider appears, then slide it to turn off the phone.
- Go to Settings > General > Shut Down, then slide to power off.
- Ask Siri by saying "Hey Siri, turn off my iPhone" if Siri is enabled.
To turn it back on, hold the side button until the Apple logo appears.
