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Regular HoursThe online Security Freeze application is available from 4:00 a.m. to 11:00 p.m. Central Time, Monday through Saturday and from 5:00 a.m. to 11:00 p.m. Central Time, on Sunday. The interactive voice response telephone system is available 24 hours a day, seven days a week except between 2:00 a.m. and 5:30 a.m. Central Time, on Sunday.