March 30, 2017 18:01 Updated Follow Call at least two full business days in advance. Remember that the call and service are free, and are required by law. Related articles Who regulates REMCs (Rural Electric Membership Cooperatives)? If I get something in the mail promoting a "protection plan" or "insurance" for my utility lines, what should I do? I'm planning to dig on my property but it's only a small task. Do I really need to call to make sure I don't damage underground utility lines?