How do I avoid Bluetooth connection and insist on ANT+ when setting up Vector 3?

I had the Vector 3 last year but returned it due to the sensor missing problems. I‘ve just ordered a new one now that the price has dropped considerably, but I seem to remember users advising the use of an ANT connection rather than Bluetooth. IIRC I think I did this with my Edge but it was impossible with my iPhone and Garmin Connect app. As I recall, it just DECIDED to pair by Bluetooth and never gave me the ANT option. How can I avoid this? If I turn Bluetooth off on my phone entirely, will the ANT connection still be possible? Thanks.