A phone call is by definition a conversation. With emails, you need many of them to create a conversation so you will probably not get the shit done with one email. With a phone call at the time you hang up, it's done.
A phone call is by definition a conversation. With emails, you need many of them to create a conversation so you will probably not get the shit done with one email. With a phone call at the time you hang up, it's done.