Google Messages has finally enabled support for dual-SIM RCS text messages, and the feature was enabled by a Telegram user. Once this feature is enabled, you can switch between two SIM cards and send RCS messages smoothly. This provides great convenience for users with more than one SIM card.
Enabling dual-SIM RCS messaging in Google Messages isn't complicated, but if you can't do that, you can wait for the stable version to roll out the feature.
The reason why this is a big problem is that Google Messages never allows the use of more than one number for RCS chat. It's worth noting that the feature is currently only available on Samsung-specific versions of the app, and only after they enabled a few test flags.
Thankfully, if you want to enable the feature in the Google Messages app, the process isn't complicated. You can check out the guide here so you can enable it:
https://thespandroid.blogspot.com/2023/12/Google-Message-Flags-Non-Root.html
However, considering that this feature has not yet been launched in the stable channel, you may encounter some problems during use, so please be sure to note that of course the new stable version of the app will be released soon, so you don’t have to wait too long before everyone can use it.