We can determine the billing cycle of the set data warning and data limit on the OnePlus smartphone ourselves, as with some mobile phone providers it is not always automatically the first day of the month.

When the set day is reached, the counted data consumption is set to zero and logged again.

Android 10 | OxygenOS 10.0
Billing cycle date -  Open the  Settings
Billing cycle date -  Tap on  Wi-Fi & network
Billing cycle date -  Tap on  Data usage
Billing cycle date -  Tap on  Billing cycle
Billing cycle date -  Tap on  Billing cycle
Billing cycle date -  Set the  Billing cycle
Billing cycle date -  Confirm with  OK
  1. Open the Settings
  2. Tap on Wi-Fi & network
  3. Tap on Data usage
  4. Tap on Billing cycle
  5. Tap on Billing cycle
  6. Set the Billing cycle
  7. Confirm with OK

OnePlus Instructions
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