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 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a  SIM card   (Dual SIM)
Step 4:  Enable or disable  Turn on
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Enable or disable Turn on

Xiaomi Instructions
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