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:
Click the OBD2 adapter "vLinker MC+".
Step3:
Wait to connect to the OBD device.
Step4:
Connected successfully.