This app and device are very useful in tracking my child's glucose levels. However it is finicky on the Galaxy S8+ we repurposed to be the reciever so we can follow through the follow app. There are many times this main receiver app on this phone will show no readings or disconnect from the transmitter and not display anything on the phone. When this happens we can still readings current through the follow app so it is still connected and getting information, just not showing on this phone.