Smart Forward combines both SIM cards; for example, if a call is received on SIM 2, it will be forwarded to SIM 1 even if SIM 1 is busy (call). This means that no more calls are missed.

Note: If smart forward is enabled on the LG smartphone, normal call forwarding will not work.

Android 9 | LG UX 9.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Call settings
Step 4:  Enable or Disable  Smart forward
Step 5:  Tap on  Save
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Enable or Disable Smart forward
  5. Tap on Save

LG Instructions