How often do you review your email signature?
When you do – here is my suggestion – send yourself an email and review your signature via a smart phone. Can the recipient click on your phone number to make a call to you? Can they click on your address so it will open a map program? Do you list your email address incase they want to forward your signature line and refer you?
Good ideas or a waste of time? But the question is not yours to ask or answer, it is your customers.