If this feature is enabled on the Xiaomi smartphone, simply flip the device when incoming call to mute the ringtone, turn off the vibration and stop the notification light.

Note: The caller is not rejected or forwarded to the mailbox.

Android 10 (MIUI 12.0)
Step 1:  Open the  Phone app
Step 2:  Open the  Settings
Step 3:  Tap on  Incoming call settings
Step 4:  Enable or disable  Flip to silence ringer
  1. Open the Phone app
  2. Open the Settings
  3. Tap on Incoming call settings
  4. Enable or disable Flip to silence ringer

Xiaomi Instructions
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