Listen to phone on Bluetooth in car
I Do not have Bluetooth or and auxiliary jack in my carso I bought a hands-free stereo receiver but I can't get it to work it's a 3.5 mm auxiliary connection
Mobile tech hands free Bluetooth re-OTHER
An iPhone only connects to a car stereo via Bluetooth.
Get help connecting your iPhone, iPad, or iPod touch with your car stereo - Apple Support
It won't work on a hands free stereo receiver.