If you were waiting to check out Google Fi because you have an iPhone, that has now changed as the company announced it is now supported.
Google Fi’s operation is fairly straightforward. It hops between carriers such as Sprint and T-Mobile and also runs of Wi-Fi when available to provide coverage.
Customers may find their pricing very favorable. With unlimited texting and calling at just $20 a month and each gig of data at $10, switching to Fi could save you money. If you use more than 6 GB it is free, although speed will get throttled at 15 GB.
As of now, most iPhone, Android, and OnePlus phones are now supported.
Source: https://www.theverge.com/2018/11/28/18115264/google-fi-iphone-android-project-official