We’ll require a little more information to take action on this thread. Did you download the app from the Play Store/App Store directly, or are you using the APK (download is here).
In general, these steps will resolve most issues with the app not launching on Android phones:
1. Battery Optimization
Samsung’s battery management may kill background apps or restrict network access:
Go to Settings > Apps > Roon ARC > Battery
Set to “Unrestricted” (not “Optimized” or “Restricted”)
2. App Permissions
Make sure ARC has all the necessary permissions:
Settings > Apps > Roon ARC > Permissions
Allow Local Network, Storage, and Location if prompted (sometimes required for local discovery)
3. Data Usage / Network Access
Settings > Apps > Roon ARC > Mobile Data & Wi-Fi
Ensure “Allow background data usage” and “Allow data usage while Data saver is on” are enabled