It's going to take up to four more years for full cell phone coverage to become a reality in Metrorail stations and tunnels. Progress on updating the Metro's full signal coverage for first responders won't begun until January of 2016. Expect cell service from major wireless carriers, Sprint, Verizon, T-Mobile, and AT&T, to also begin installing their own cables during that time period. [WAMU] [Photo via erin m]