I installed the app 'ZY Play' from Google Play Store on the Galaxy S7 and S8 and was able to successfully connect the devices to the gimbal via Bluetooth. In the beginning, you have to try a few times until the connection works. If the gimbal is not found in the app ('Connect your device' click), you have to close the app and restart it. In the meantime it works every time without problems and first tests were successful.
According to the website (
https://www.zhiyun-tech.com/smooth4... - see Download, Software), the device is compatible with the Samsung Galaxy S9, so I think you can rely on that. I would definitely buy it - but here of course is my disclaimer: WITHOUT WARRANTY.
