For LG devices with dual SIM function, the respective SIM card can be activated or deactivated. if the card is deactivated, no calls or messages will arrive. the SIM card is then treated as if it had not been inserted.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Dual SIM Card
Step 3:  Enable or Disable  SIM card 1  /  SIM card 2
  1. Open the Settings
  2. Tap on Dual SIM Card
  3. Enable or Disable SIM card 1SIM card 2

LG Instructions
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