Samsung is phasing out Samsung Messages. Since you've confirmed that you've searched the Galaxy Store and cannot find it, I'm guessing it starts with the newest flagship, no more Sammy Messages.
When asked about Samsung Messages being phased out Google said this.
Samsung is phasing out the native Samsung Messages app in favor of Google Messages, which is now the default app on new devices like the Galaxy S25. While older phones can still use Samsung Messages, it no longer supports RCS (Rich Communication Services) on many US carriers, resulting in a loss of features like typing indicators and high-quality image sharing.
Key Details on the Shift:
- Default App Status: Google Messages comes pre-installed as the default app, while Samsung Messages is no longer pre-loaded on new models.
- RCS Support Ended: Starting in early 2025, Samsung Messages lost RCS support on several carriers, including Verizon.
- Availability: Although being phased out, the Samsung Messages app remains available for download on the Galaxy Store.
- Reasoning: The move is a collaboration with Google to provide a more consistent, feature-rich, and universally compatible messaging experience (RCS) across Android devices.
Despite this transition, users can still download and use Samsung Messages if they prefer its interface, though it will not offer the same, modern messaging capabilities as Google Messages.