By default, the billing cycle for mobile data use is reset on the 1st of the month. If the operator uses a different day for billing mobile data, this can be adjusted in the settings of the Samsung device. At the time of the set date, the data count is reset to 0.

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:  Tap on  Start billing cycle on
Step 6:  Change  date  and confirm with  Set
  1. Open the Settings
  2. Tap on Connections
  3. Tap on Data usage
  4. Tap on Billing cycle and data warning
  5. Tap on Start billing cycle on
  6. Change date and confirm with Set

Samsung Instructions
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