This would probably only happen in near-emergency situations, e.g., the CSUN internet server evaporates for a long period, hanging chads, etc. Email is always your first best bet for reaching me. I check my email many times during the day from CSUN, home, at the beach, and the ballpark. Naturally, I don't check my email quite as often on the weekend, but about the only time I don't check my email is when I'm out of town. Unfortunately, that doesn't happen often enough, but I'll let you know when it does.
Email is faster.
I don't sit my office waiting for the phone to ring, but I usually have email access wherever I am. That's the number for the Department of Marketing. Ask the secretary to leave a message for me. Finally, I do have an office, BB4151. My office hours are posted above.