The cost saving mode allows you to assign a SIM card to each contact, and when the contact is called, the stored SIM card is used even if the other SIM card is active.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Dual SIM Card
Step 3:  Enable or Disable  Cost save mode
Step 4:  Confirm with  OK
  1. Open the Settings
  2. Tap on Dual SIM Card
  3. Enable or Disable Cost save mode
  4. Confirm with OK

LG Instructions
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