Transit Wireless says it's now put WiFi in its 100th station and is on track to put WiFi in all 279 underground stations by 2017.
The company has started the fourth of seven phases to install access in all of the city's underground stops, including 37 underground subway stations in Upper Manhattan and the Bronx.
This phase includes major transfer stations along the 4, 5, and 6, lines.
Riders can access the service by connecting to the "Transit Wireless WiFi" option on their tablet or mobile device.