How to enable auto-answer calls feature in iOS 12 for iPhone/iPad/iPod Touch

Open the ‘Accessibility Settings’: Settings > General > Accessibility. (See the article Open Accessibility Preferences on this website for more information.)
Under the ‘Interaction’ section, tap ‘Call Audio Routing’.
Tap ‘Auto-Answer Calls’.
Tap the toggle switch next to ‘Auto-Answer Calls’.
You can now alter the time limit after which calls are automatically answered - the default is 3 seconds. To adjust the time limit, tap on the blue ‘+’ (plus) or ‘-‘ (minus) buttons.
When happy with your settings, either tap the back button in the top left of the screen to return to the main ‘Accessibility’ settings screen, or press your device’s ‘Home’ button to return to the home screen.

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