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When using Dual SIM, we can assign a default SIM for outgoing calls to the stored contacts on the Oppo smartphone so that we do not always have to select the corresponding SIM card before dialing.

If a contact has several phone numbers (private, business) stored, the desired SIM card can be set for each individual phone number.

Android 11 | ColorOS 11.0 | Google Contacts
Step 1: Tap on  Contacts
Step 2: Choose a  Contact
Step 3: Open the  Menu
Step 4: Tap on  Set calling SIM
Step 5: Choose a  SIM card  and tap  OK
  1. Tap on Contacts
  2. Choose a Contact
  3. Open the Menu
  4. Tap on Set calling SIM
  5. Choose a SIM card and tap OK
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Oppo Instructions