On the Oppo smartphone, we can decide for outgoing calls whether our number should be displayed or suppressed. In the latter case, our number is not displayed to the caller, but "Unknown caller". We can display or suppress our caller ID under ColorOS in the phone settings.

Android 10 | ColorOS 7.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Carrier call Settings
Step 5:  Tap on  Additional settings
Step 6:  Choose  SIM-Card  you want
Step 7:  Tap on  My Number
Step 8:  Choose between  Network Default,   Hide Number  and  Show Number
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Carrier call Settings
  5. Tap on Additional settings
  6. Choose SIM-Card you want
  7. Tap on My Number
  8. Choose between Network Default, Hide Number and Show Number

Oppo Instructions
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