If your app is not working on your phone, please check the compatibility of your phone with the app. Andriod 4.3 and better. iPhone 4 and better. You can also visit these links to check your Bluetooth and ANT+ compatibility of your devices: Bluetooth: bluetooth.com/Pages/Bluetooth-Smart-Devices-List.aspx ANT+: thisisant.com/directory For more FAQ and app support, please visit our website: jetblackproducts.com/app
