Social Security Administration: 1-800-772-1213 ( TTY users call 1-800-325-0778) Monday through Friday: 7:00 a.m. - 7:00 p.m. California Department of Aging: 800.510.2020. Disabled Members Access (Transport): 1-909-383-1680. Elderlink: 1-800-613-5772. Hear Now (Hearing Aides): 1-800-648-4327..