The MTA is also planning on adding USB ports to stations, buses and subway trains to allow New Yorkers to charge up their mobile devices while on the go. 200 subway cars will have a USB port added this year, with another 400 coming in 2017. 1500 buses will offer Wi-Fi and USB ports by 2018.
Currently, 140 subway stations are hooked up to cellular and Wi-Fi signals. All 277 will have Wi-Fi connectivity by the end of 2016. All subway stations will have cellular service by early 2017.
source: MTA via Engadget