When you receive a Signal Loss message, this means that your Sensor has not automatically communicated with the App in the last 5 minutes.

You should make sure your phone is within 6 meters (20ft) of your Sensor. You should try scanning your Sensor to get a glucose reading. Then try turning Bluetooth OFF then ON again. If that doesn’t work, you should try turning your phone OFF and ON again. If Signal Loss message shows again, you should contact customer service.