The SIM card PIN can be changed in the security settings on the LG phone, but the SIM lock must be enabled to make a change.

The PIN must consist of a minimum of four and a maximum of eight numbers.

Android 9 | LG UX 9.0
Change SIM PIN -  Open the  Settings
Change SIM PIN -  Tap on  General
Change SIM PIN -  Tap on  Lock screen & security
Change SIM PIN -  Tap on  Set up SIM card lock
Change SIM PIN -  Tap on  Change SIM PIN
Change SIM PIN -  Enter current  PIN  and confirm with  OK
Change SIM PIN -  Enter new  PIN  and confirm with  OK
Change SIM PIN -  Confirm new  PIN  and tap on  OK
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Set up SIM card lock
  5. Tap on Change SIM PIN
  6. Enter current PIN and confirm with OK
  7. Enter new PIN and confirm with OK
  8. Confirm new PIN and tap on OK

LG Instructions
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