I don't use close.io, but here's what I'd also recommend if you haven't done them already:
1) allow the user to enter their phone numbers in whatever format they want: 4081231234, (408)123-1234, 408-123-1234 and format it after they click 'save' to (408)123-1234 or however you want it.
2)Cache the domain of the email address for autocomplete suggestions if they enter a website. For example, if you type in phil@close.io for the email, I can already suggest http://close.io if you start typing in a website address.