I don't even answer the phone.
Caller ID eliminated any credibility from phone polls ever had.
Right, that is why "Big Data" is frequently a much better choice. The issue is that Big Data is new. As such there isn't a lot of usage, compared to survey data. It comes down to people using what they are comfortable with, even though it may not provide the best information.
The proxy for gun ownership, as long as it is corrected for regional despair rates, that uses forms of suicide, as mentioned in the article, is probably a better test than the survey approach. They did not compare that data in the article, I think it would be an interesting way to go with this data. . . Don't steal my idea, I am thinking that I may write that article and see if I can get it published.