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By default, Samsung calls the SIM cards "SIM 1" and "SIM 2", but in the SIM card management, the name of the SIM card can be renamed as desired.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Connections
Step 3: Tap on  SIM card manager
Step 4: Choose a  SIM card   (Dual SIM)
Step 5: Tap on  Name
Step 6: Enter a  Name  and tap  Done
  1. Tap on Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Choose a SIM card (Dual SIM)
  5. Tap on Name
  6. Enter a Name and tap Done
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Samsung Instructions