Agreed about hearing a voice, but I'm not putting a number on the internet. I have 2 phones, one only for this part of my life. I learned the hard way guys will call drunk at 3AM and if they don't want to provide screening info, there's no point in talking.
I'm not going to literally write down their info from a phone call, best to email it so I can just hit delete.
I do have a one call preference before I meet, like you said, you can tell a lot about a person's demeanor with an actual conversation.