When an SMS (message) is successfully sent on the LG smartphone, the device plays a short tone, which can be turned on/off in the message settings.

Android 9 (LG UX 9.0)
Step 1:  Open the  Messages -App
Step 2:  Open the  Menu
Step 3:  Open the  Settings
Step 4:  Tap on  General
Step 5:  Enable or Disable  Hear outgoing message sounds
  1. Open the Messages-App
  2. Open the Menu
  3. Open the Settings
  4. Tap on General
  5. Enable or Disable Hear outgoing message sounds

LG Instructions
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