Someone actually tested the phone number on the sign and found that it not only works but is answered by a machine:
Breaking Bad spin-off Better Call Saul is an upcoming American comedy-drama television series scheduled to premiere on AMC in early 2015. Filming is taking place near the Albuquerque High School campus.Hello! You've reached the law office of James M McGill esquire, a lawyer you can trust. Kindly leave your information at the tone and Mr McGill will phone you promptly.