This is more a little gadget than useful, you can create a little message which shows up as soon as your device is locked. 

Android 9
Step 1:  Open the  settings
Step 2:  Tap on  Security & location
Step 3:  Open the  settings
Step 4:  Tap on  Lock screen message
Step 5:  Type in a message and confirm with  SAVE
  1. Open the settings
  2. Tap on Security & location
  3. Open the settings
  4. Tap on Lock screen message
  5. Type in a message and confirm with SAVE

Android Instructions
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