What is the phone number for dot customer service? DOT Customer Service Center: 202-366-4000 Monday through Friday between 8:30 am and 5:30 pm Eastern Time excluding Federal Holidays. Deaf, hard of hearing, and speech impaired callersHow do i contact the new york state department of transportation? Call Us. DOT Customer Service Center: 202-366-4000. Monday through Friday between 8:30 am and 5:30 pm Eastern Time excluding Federal Holidays. Deaf, hard of hearing, and speech impaired callers. Contact the general information switchboard using the Federal Relay Services. Mail Us. Correspondence to the Department may be sent to:How do i contact ncdot by phone? For all other NCDOT questions (not DMV), call 1-877-DOT-4YOU (1-877-368-4968) weekdays from 8 a.m. to 5 p.m. For emergencies, please call 911. ContactWhat is the dotdot portal? DOT is a portal where you get free, instant online claims processing and easy access to patient eligibility and benefit information 24/7. DOT already makes your life easier, and now with a new look and feel, it will revolutionize your daily office tasks.