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If the "Do Not Disturb" mode is activated on the Oppo-Smartphone, repeated calls of the same phone number can be allowed. The caller must call again within 3 minutes. By default, this function is deactivated under ColorOS.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  Do Not Disturb
Step 4: Enable or disable  Ring for repeated calls
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on Do Not Disturb
  4. Enable or disable Ring for repeated calls
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Oppo Instructions