In a Tweet posted by @Android today, Google and AT&T have agreed to
make Google Messages the default messaging app for all Android phones
sold by the carrier. While most Android devices already come
pre-installed with Google Messages, Samsung phones continued arriving
with Samsung's built-in messaging app that did support RCS, but does
not support Google's recently enabled end-to-end encryption for
one-on-one chats.

With T-Mobile agreeing to do the same a few months ago, and now AT&T
pledging to completely switch to Google Messages' RCS, Verizon is the
only major US carrier left to make the pledge to make Google Messages
the default app for messaging on its Android phones. As of now,
Verizon continues to pre-load its self-branded Messages+ app as the
default.

https://www.gsmarena.com/at_t_sets_google_messages_as_default_sms_app_for_all_its_android_phones-news-49825.php

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