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Almost all our meetings are set up over email, IM or text. And the vast majority of communication is online too. So requiring a phone is a sign that the old way of doing things is not gone, and it will make it harder to get traction, especially from the HN crowd and people with poorer English.

> So requiring a phone is a sign that the old way of doing things is not gone

It isn't gone. You are in the minority.

But that being said, maybe there is an argument that the OP needs to cater to the new things.

This is a total non starter for me as well, at least have 100% email as an option. I don't pick up numbers I don't have in my address book, so you would get my voice mail, which would result in me emailing you anyway.

Consider that some people may want to create an account as a way to explore the service more, before committing to using it.