My setup routine for Google Messages before texting on a new phone

How to upgrade Google Messages in under five minutes ...
The Droid Guy

Google Messages RCS Not Working on Android: Fix Chat Features, Carrier Sync, and Dual‑SIM Issues

RCS (“Chat features”) in Google Messages can be great when it works: typing indicators, better group chats, higher-quality media, and Wi‑Fi messaging in some cases. When it doesn’t work, the symptoms ...
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How to enable, disable, and use RCS chat in Google Messages

Since Google's push to RCS standards in 2019, Android's Messages app by Google offers great in-house features. After you've opened Google Messages and enabled RCS chats, you'll find typing indicators, ...

First look: Google Messages is finally catching up with live location sharing

Once real-time location sharing is active in Google Messages, a persistent banner appears at the top of the chat, clearly indicating that live location sharing is on and showing how much time is left.
Android Authority

Here's the latest progress on how Google Messages @mentions are going to work

Google Messages has been working on a system to let you @mention other users in chats. Users who are mentioned in such a manner should see an @ symbol next to the chat. Messages may automatically ...