Most devices can't remember more than 1 phone at a time, so you have to continually put the thing back into pairing mode. Every device has a different way of putting it into pairing mode. Sometimes there's a code to type, adding an additional step. Then it's several clicks on the phone to connect to the device.
Plugging in a cable is often a lot simpler, and it works every time.
Plugging in a cable is often a lot simpler, and it works every time.