Originally Posted by canadiancow

I don't agree that an email isn't sufficient. I think it's better than a phone. If an unknown number calls me, I'm unlikely to answer. If an unknown email emails me, I'll still see the subject, and can then make a decision as to open it.

In my experience, younger crowds are much less likely to answer a phone call than older crowds. There isn't going to be a one-size fits-all solution.