The most dangerous thing you can do is type on a phone (texting, calling someone). So that kind of thing is mitigated by going hands free.
However a bunch of studies have shown that talking to someone on the phone is more dangerous than talking to someone in the car. If I remember correctly there’s a few factors involved.
1) It requires more focus to talk ot someone on the phone in general since we haven’t really evolved to interact with someone who isn’t in our physical space.
2) When someone is a passenger in the car, they are aware of the physical space as well. If something happens like a car in front slams their breaks, your passenger is likely going to notice and alert you or stop talking so you can focus on avoiding danger.
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