Phone numbers for Senators’ offices, both voice and TTY are available by calling the Capitol Switchboard: 202-224-3121 (voice) or 202-224-3091 (tty)
The Congressional Special Services Office: 202-224-4048 (voice) or 202-224-4049 (tty)
The Federal Relay Service: 800-877-8339 (voice/tty)
The Washington DC Relay Service: 202-855-1000 (voice) 202-855-1234 (tty)