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
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Lock screen & security
Step 4:  Tap on  Set up SIM card lock
Step 5:  Tap on  Change SIM PIN
Step 6:  Enter current  PIN  and confirm with  OK
Step 7:  Enter new  PIN  and confirm with  OK
Step 8:  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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