It is not uncommon for Google to open public beta programs for its various applications, and nowadays it is being extended to Google Messages. As of today, there is an open beta version available for Google messages. Here is how to join.
As in other applications, Google Messages is running its beta program through the Google Play Store. First, there is a direct link that you can access here. Alternatively, the Play Store listing for Google messages on your Android device should show an option to opt for the beta program at the bottom of the list.
Once you have registered in the beta program, all future updates of the messages will be part of the beta track. This could mean some errors or additional problems, but since it is a public beta, things will probably remain fairly stable.
At the time of writing this report, several members of the 9to5Google team have registered for the beta version, but there are still no updates available. Presumably, future updates on this track will help with some of Google’s RCS plans, or they will simply present new features to the application a little earlier than we would normally have them. Of course, stay tuned for more about that.
On July 8, 2019, Messages, the Google messaging application for Android phones, will begin an Open Beta program! Open Beta offers users the opportunity to test and provide comments and opinions on experimental functions that have not yet been released to the general public.