The average monthly cost of Google's MVNO (Mobile virtual network operator) called Google Fi ranges from $30 to $80, or $70 for the unlimited plan. Some subscribers received a Google Fi account this month for zero ($0) which is clearly a bug.
Google sent an email to affected customers, acknowledging the error as a “technical issue” and apologizing. Those who received a Google Fi bill that said their monthly charge was $0 will be charged the actual amount next month.
“We would like to apologize for the error we made on your last bill, in which you were not charged for Fi service due to a technical issue on our part. We would like to inform you that we will include the amount you are due on your next bill in addition to your corresponding charges for the following month. We apologize for the inconvenience.”
There have been several reports to Google today from Google Fi users who opened their monthly bill email and found that the total payment is $0 and that "they will not be charged anything this month."

However, the app quickly reveals how this is a mistake, as “last month’s data” is also reported to be zero (0 GB).
As we mentioned above, many users have contacted Google, so support representatives are aware of the problem. We don't know any more details about the bug other than that it is technical in nature, as the company.

