The Cell Phone Lot is located on Autopilot Drive. From the Dulles Access Highway or Dulles Toll Road heading towards the Airport, stay in the right lane, past the first exit, and take the SERVICES exit (The Marriott lake will be on your right). Follow the ramp and bear right onto Aviation Drive. The Dulles Marriott Hotel will be on your right. Stay in the right lane until you reach the stoplight at the intersection of Aviation Drive and Autopilot Drive. Turn right onto Autopilot Drive and continue straight. The Cell Phone Lot entrance will be on your right. http://www.flydulles.com/iad/cell-phone-lot for a map
I will let others respond to that.
Don't have a physical address, but when you're driving towards the airport, you'll see signs for the Cell Phone lot.
Thanks! Your answer is awaiting moderation.