The Advertising ID is a randomly generated number that identifies the LG smartphone and is used to assign interests and usage patterns (but not personal information such as name, etc.) to display personalized advertising.

On the LG smartphone, or on Android, it is possible to reset the ad ID, which creates a new profile.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Google
Step 4:  Tap on  Ads
Step 5:  Tap on  Reset advertising ID
Step 6:  Confirm with  OK
  1. Open the Settings
  2. Tap on General
  3. Tap on Google
  4. Tap on Ads
  5. Tap on Reset advertising ID
  6. Confirm with OK

LG Instructions