How to turn on the phone if the switch on/off key is broken:
1. First, power off the phone completely. If possible, you'd better remove the battery and then install it.
2. Then press and hold the volume down button, and some models press the volume up button.
3. Connect the phone to the charger, and the English interface will appear.
4. Then release the volume key and wait about 20 seconds, the phone will start automatically.
5. If this method does not work, you can connect the mobile phone to the computer with a data cable.
6. Open the commonly used management software, and the phone will be automatically identified. Click "Restart" in the "Tools" of the software.