Carista Download link:Carista OBD2 on the App Store (apple.com)

NOTE:

Just enable Bluetooth settings on your iOS device.
DO NOT Need to connect Bluetooth Name on iOS device.
Then connect the Bluetooth device name in the OBD app setting.

Step1:
Open the app and click on:"Connect".





Step2:
Choose the OBD2 adapter "vLinker MC+".





Step3:
Waiting for the device to connect to the vehicle.





Step4:
Connected successfully.