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The SMS delivery report notifies us when the SMS has reached the recipient. On Oppo smartphones, the SMS delivery report is deactivated by default, but can be activated in the message settings, even separately for each SIM card.

Android 11 | ColorOS 11.0 | Google Messages
Step 1: Tap on  Messages
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Choose a  SIM card   (Dual SIM)
Step 5: Enable or disable  Get SMS delivery reports
  1. Tap on Messages
  2. Open the Menu
  3. Tap on Settings
  4. Choose a SIM card (Dual SIM)
  5. Enable or disable Get SMS delivery reports
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