From an email:
“Together with the Washington Regional Alcohol Program (WRAP) SoberRide initiative, AT&T is proud to provide free taxi rides (up to $30) to anyone over 21 in the greater Washington, DC area this Saturday, March 17 from 10pm until 6am on Sunday.
AT&T customers can call #TAXI to get a safe, free ride home, while others can dial 800-200-TAXI.”