We send our warning emails when your pageviews quota balance drops below 50%, 25%, 10% and 0% .
When your pageviews quota balance reaches 0%, your services will stop. For example if you are running geo redirects, the redirection will stop. If you are showing content using the geo content service, the content will stop being displayed.
Once your pageviews quota balance hits 0%, you can do one of the following:
wait till the next date of your billing cycle to have it replenished
re-subscribe to the same plan to start a new billing cycle
re-subscribe to a bigger plan if the current plan quota will be insufficient