LG How to End a Call using Power Button
LG 1090An ongoing call on the LG smartphone can be ended by pressing the on/off key, which still needs to be activated in the settings.
Android 9 | LG UX 9.0
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
- Open the Phone-App
- Open the Menu
- Tap on Call settings
- Tap on Answer and end calls
- Enable or Disable End call with the Power key