I was just reading a WordStream article on call only ads that suggested creating a remarketing audience of callers from ads who didn't convert. That sounds like an excellent idea to me. But . it's not possible is it? You can't use call conversions from ads as an audience source? There are 3 people in the comments on this article all saying "how do you do this? " Nobody from WordStream has ever bothered responding to any of it. Anyone got any ideas how/if this is actually possible?
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