If someone's speaker is playing on your phone through the same Wi-Fi network, it likely means their speaker supports wireless casting.
Disconnect from the Speaker: Pull down the Quick Settings panel on your Samsung phone. Look for a "Media Output" option (next to volume control). Select it and switch the output back to your phone’s speaker.
Forget the Device (If Previously Connected via Bluetooth): Go to Settings > Connections > Bluetooth. Find the speaker in the list, tap the settings icon, and select Forget or Disconnect.
Disable Nearby Device Scanning: Go to Settings > Connections > More Connection Settings. Turn off "Nearby Device Scanning" to prevent automatic detection of speakers on the same network.
Check SmartThings and Google Home: If you’ve connected to the speaker via Samsung SmartThings or Google Home, open those apps and remove the speaker from your device list.
Disconnect from the Shared Wi-Fi Network Since this is likely happening because you're on the same Wi-Fi network, you can forget the current Wi-Fi and use mobile data instead
Restart your phone and the Wi-Fi router to refresh network connections.
