Project Fi is Google's mobile network that provides users with cellular service around the world. Although it was initially invite-only, for the past couple of years, it has been open to the public, as long as you have a supported handset that can take advantage of the service. Despite coverage being available in over 135 countries, it looks like some folks are having issues when it comes to connectivity.
According to some members of Reddit, Project Fi has stopped working. While it is hard to tell just how many are affected, the small sample shows that problem exists in India, Germany, China, Argentina, Taiwan and more. Those affected do not have access to data and calling into Project Fi customer service, users have been told that there is indeed a data outage but there isn't an ETA of when this problem will be fixed.
Google's service is different from standard cellular services as it charges a flat rate, but also issuing refunds for unused data. Project Fi different can switch between different networks depending on signal strength and can also transition service from cellular to Wi-Fi. Hopefully, there will be a resolution soon.