Apple or Android?
Configure your Android to not auto start but let the vehicle decide. Then on your vehicle on device manager setup what you want. If either calls and/or media, or android auto or nothing. It will stop reconnecting.Thanks for bringing this up, Doug!
I have an Android, and once my van grabs it, it won't let it go. I can disconnect it in the Settings under Android Auto, but the next time I start the car, it grabs it again.
I tried to turn Bluetooth off, but that doesn't work when connected to the van!
To keep the van from connecting every time I start it, I've had to delete the device entirely.
I'd also love to hear if there's a way to connect/disconnect the phone when desired without having to turn off Bluetooth before starting the van.