Denver International Airport has become the first airport in the world to offer travelers free (advertisement-supported) domestic and international phone calls.
The service, called RMT Free Phone, can be used through over 200 landline phones at the Jeppesen Terminal and all the 3 concourses.
The international calls are free for the first 10 minutes. Calls within the United States do not have a time limit.
International calls longer than 10 minutes cost $0.25 per minute + 15 percent tax.
Travelers have to watch SMS-advertisements or 15-second digital advertisements on 17-inch LCD screens at phone terminals to use the service.