Unfortunately, the LG smartphone can only store up to 9 speed dial numbers. With the small speed dials, it is necessary to remove one from time to time. In addition to a single speed dial, several or all can be deleted.

Note: Speed dial 1 (mailbox) cannot be deleted.

Android 9 | LG UX 9.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Speed dial
Step 4:  Tap on  Remove
Step 5:  Select desired  contacts
Step 6:  Tap on  Remove
Step 7:  Confirm with  Remove
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Speed dial
  4. Tap on Remove
  5. Select desired contacts
  6. Tap on Remove
  7. Confirm with Remove

LG Instructions