Regardless of how good your work is, if your viewer cant get in touch with you, youre not getting any work. Its really simple for you to add contact details to your site. Whether its a contact page, a phone number on every page, or an email address in the footer, finding your contact information should be a breeze for your users.
You can put whatever you want for your contact details, just make sure that whatever you do put, is correct. A simple phone number will do, although if a potential client isnt fond of the telephone, it may be better if they knew your email address as well. Remember to think about all your users before you make any final decisions.