The "Reset network settings" function resets all network settings, such as WLAN, mobile data or Bluetooth, to their original state.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Restart & reset
Step 4:  Tap on  Network settings reset
Step 5:  Choose desired  SIM card
Step 6:  Tap on  Reset settings
Step 7:  Enter  PIN / Password / Pattern
Step 8:  Confirm with  Reset Settings
  1. Open the Settings
  2. Tap on General
  3. Tap on Restart & reset
  4. Tap on Network settings reset
  5. Choose desired SIM card
  6. Tap on Reset settings
  7. Enter PIN/Password/Pattern
  8. Confirm with Reset Settings

LG Instructions