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On the Oppo smartphone we can have emergency notifications sent to us, which are CB (Cell Broadcast) messages containing warnings about extreme or serious threats in the current environment.

Under ColorOS, these emergency notifications are already enabled by default, and can be disabled if desired.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Security
Step 3: Tap on  Wireless emergency alerts
Step 4: Enable or disable  Allow alerts
  1. Tap on Settings
  2. Tap on Security
  3. Tap on Wireless emergency alerts
  4. Enable or disable Allow alerts
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Oppo Instructions
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