By default, the data warning is turned on on Samsung devices and warns when 2 GB data volume is reached, and can be turned on and off in the data usage settings.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  Data usage
Step 4:  Tap on  Billing cycle and data warning
Step 5:  Enable or disable  Set data warning
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Data usage
  4. Tap on Billing cycle and data warning
  5. Enable or disable Set data warning

Samsung Instructions
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