Google Fi Now Supports RCS
Google has announced they are rolling out RCS Chat on the Google Fi network starting today.
The new RCS chat will work with Pixel phones, the Moto G6, Lg V35, LG G7, and the Android One Moto X. If your phone is not part of that list, but is on the Google Fi network, you can download the new Google Messages App to take advantage of RCS.
RCS is designed to be the next generation replacement for SMS. With RCS you gain new features like sending higher resolution image and videos, texting over wifi, typing indicators, read-receipts, and better group chats.
Other carriers in the USA are working to adopt RCS in 2019, but most will just be calling it "Chat."
Source: Google Blog