Carista Download link: Carista OBD2 - Google Play 

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





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 BM".





Step4:
Open the app and click on:"Connect".





Step5:
Click the OBD2 adapter type "vLinker MC+".





Step6:
Pick OBD2 device "vLinker BM".





Step7:
Wait for the app to connect to the OBD device.





Step8:
Connected successfully.