Hi there! I see you're experiencing an issue where you can't hear any sound from the Nostalgie Radio app on your Samsung Android phone. I completely understand how frustrating that can be. Let’s work together to troubleshoot this.

Here are some steps you can follow:

1. Check Volume Levels: Make sure that the volume on your phone is turned up. You can do this by pressing the volume buttons on the side of your phone while the app is playing to ensure the media volume is high.

2. Remove External Devices: If you have any headphones or external speakers connected, try disconnecting them. Sometimes audio can route incorrectly with these devices.

3. Bluetooth Connections: Check if you're connected to any Bluetooth devices. If so, disconnect from them to see if the app will play sound through your phone’s speakers.

4. Restart the App: Close the Nostalgie app completely and then reopen it. Sometimes, restarting the app can resolve sound issues.

5. Restart Your Phone: A simple restart of your phone can often fix many temporary issues.

6. App Permissions: Go into your phone's settings, find the Nostalgie app under 'Apps', and check if it has the necessary permissions, especially for sound.

7. Reset App Preferences: If none of the above work, you can try resetting your app preferences. In your phone's settings, go to 'Apps' > 'Menu' (three dots in the top right) > 'Reset app preferences'.

8. Factory Reset Settings: If the problem persists and it started after an update, you might consider going to 'Settings' > 'About Phone' > 'Reset' > 'Reset All Settings'. This will reset your settings, including network settings, but you'll need to re-enter your Wi-Fi passwords.

If after trying these steps you’re still having issues, it could be worth checking with Samsung support or looking into whether there's a known issue with your app version.

Please let me know how it goes or if you need further assistance! Are you satisfied with the solution I provided?