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If we use dual SIM on the Xiaomi smartphone, we can deactivate one SIM card if desired, which means that no calls or messages are put through or received from the selected SIM.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM cards & mobile networks
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Turn On or Off the  selected SIM card
Step 5: Tap on  OK
  1. Tap on Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Turn On or Off the selected SIM card
  5. Tap on OK
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Xiaomi Instructions