To see how the Samsung Gear Fit is supported by non-Samsung phones like the Redmi Note 3, you will need the third-party Open Fit App since the Gear Fit Manager won't be compatible with other non-Samsung devices. The Open Fit App can be downloaded for free through the Google Play Store.
Once the Open Fit App is installed and opened, it will prompt you for Notification Access. Select 'Open Fit' to turn on Notification Access.
To connect the Open Fit App with the Samsung Gear Fit, first turn on Bluetooth and select 'Scan' for the App to find the Gear Fit. Then tap on 'Show Devices' and select 'Gear Fit (5105)' from the list of the devices. After that, select the 'Connect' option from the Open Fit App's home screen.
The Samsung Gear Fit will generate a unique code and ask you to confirm the passkey on the Open Fit App. At the same time, you will get a pop up for Bluetooth pairing request with the passkey on your phone.
Once you confirm the code, the App will establish the connection and to verify the same you can go to the phone's notification menu and see if there is an Open Fit notification showing the Gear Fit connected.
It's good to see that the Samsung Gear Fit works fine with non-Samsung phones like the Redmi Note 3 using the Open Fit App to track your fitness data, weather updates, messages and phone call notifications and more.