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If you visit http://192.168.0.1 in your browser, you should see a screen that has a few charts, below the circular charts, it will state when your allowance resets. Allowance resets don't always mirror when the billion period starts.
I think when/if you change plans, your bucket resets to full. But, there's a limit to how many times you can do this, so people can't just siwtch plans, refill, then switch back when it's convenient.
If you visit http://192.168.0.1 in your browser, you should see a screen that has a few charts, below the circular charts, it will state when your allowance resets. Allowance resets don't always mirror when the billion period starts.