> In October 2019, the four major U.S. carriers announced an agreement to form the Cross-Carrier Messaging Initiative to jointly implement RCS using a newly developed app. This service was to be compatible with the Universal Profile.[34] However, this carrier-made app never came to fruition. And later, both T-Mobile and AT&T signed deals with Google to adopt Google's Messages app.

https://en.m.wikipedia.org/wiki/Rich_Communication_Services