On Oppo smartphones with dual SIM, the SIM cards are named SIM1 and SIM2 by default. To make the SIM cards more easily distinguishable, the name of the respective cards can be changed as required. The maximum permitted length is ten characters.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  SIM card & mobile data
Step 3:  Choose desired  SIM card
Step 4:  Tap on  SIM card name
Step 5:  Enter desired  Card Name  and confirm with  Save
  1. Open the Settings
  2. Tap on SIM card & mobile data
  3. Choose desired SIM card
  4. Tap on SIM card name
  5. Enter desired Card Name and confirm with Save

Oppo Instructions
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