Final answer:
When a certified operator changes their contact information, the licensee must notify the department within 30 days to ensure all records are up to date and maintain proper communication channels.
Step-by-step explanation:
If the certified operator changes his phone number or address, the licensee must notify the department within 30 days . This is a standard procedure in many industries to ensure that all official records are up to date, and so that the department can maintain effective communication with the certified operator for legal, operational, and emergency purposes. The specific time frame can vary depending on the regulations of the agency or department in question, but it is critical for the licensee to comply with these rules to avoid potential issues or penalties.