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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 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM card & mobile data
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Tap on  SIM card name
Step 5: Enter a  Name  and tap on  Save
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Choose a SIM card (Dual SIM)
  4. Tap on SIM card name
  5. Enter a Name and tap on Save
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Oppo Instructions
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