Alfa OBD Download link:  AlfaOBD - Google Play 

Step1:
Open your phone's Bluetooth Settings, search for and tap "vLinker FD-Android".





Step2:
A request pairing prompt will be generated when pairing, enter the pairing code "1234" and click "OK".





Step3:
Successfully paired to the Bluetooth device "vLinker FD-Android".





Step4:
Open the app and click on Bluetooth.





Step5:
Select the paired Bluetooth device "vLinker FD-Android".





Step6:
Connected successfully.