The lock screen of the Samsung smartphone or tablet can display contact information of up to 65 characters, which could be a simple welcome text or contact information such as phone number or email address in case the device is lost.

Note: Contact information is visible to everyone on the lock screen.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Tap on  Contact information
Step 4:  Enter desired  Contact Information  and confirm with  Done
  1. Open the Settings
  2. Tap on Lock screen
  3. Tap on Contact information
  4. Enter desired Contact Information and confirm with Done

Samsung Instructions
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