Contacts on the Oppo smartphone can also be added to the birthday, and apart from saving the birthday, ColorOS offers no other functions such as reminders or the like.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Contacts -App
Step 2:  Tap on  Contact  you want
Step 3:  Open the  Menu
Step 4:  Tap on  Edit
Step 5:  Tap on  Birthday
Step 6:  Enter  Birthday  and confirm with  Save
  1. Open the Contacts-App
  2. Tap on Contact you want
  3. Open the Menu
  4. Tap on Edit
  5. Tap on Birthday
  6. Enter Birthday and confirm with Save

Oppo Instructions
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