He came back to me. In itself that was a surprise because he had nothing to offer me in the way of business. What he demanded (no please) were their locations and phone numbers. I don't need a deep dive into data analytics to predict he will be bankrupt within 18 months. I didn't respond.
The new etiquette of business is low-touch digital. We only move on to the high-touch phone (as well as in-person) after we have established the framework for the relationship. That includes the decision if we want to proceed to the next step in conducting business. Low-touch digital eliminates the need for any hint of personal intimacy.
Setting out with a phone call is not only bad etiquette. It brands professionals as out of touch.