About 90% of subway stations have free wifi through Transit Wireless, but quality varies wildly during peak usage periods. Times Square, Union Square, 14th Street-Union Square have most reliable connections even during rush hour.

Underground tunnels between stations still have limited cell service on most lines, though newer stations like Hudson Yards and World Trade Center have cellular signal boosters that provide stronger coverage. L train has improved cellular coverage between 8th Avenue and Canarsie-Rockaway Pkwy after renovations, though some gaps persist in tunnels.

Download offline maps before going underground. Citymapper works offline and shows real-time delays even without internet once app has loaded.