If the "Auto switch to ear receiver" motion control is activated, the Oppo-Smartphone detects the movement to the ear during a phone call and the call is automatically switched from the speaker to the earphone.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Convenience tools
Step 3:  Tap on  Gestures & motions
Step 4:  Enable or Disable  Auto switch to ear receiver
  1. Open the Settings
  2. Tap on Convenience tools
  3. Tap on Gestures & motions
  4. Enable or Disable Auto switch to ear receiver

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