The short answer
It depends entirely on which line and which stretch of tunnel you're on. For years, the NYC subway had essentially no cell signal underground, a running joke among both locals and visitors. That's been changing: the MTA has been working with carriers to bring cell service into more tunnel segments across the system, but the rollout is gradual and line by line, not a single switch that turned signal on everywhere at once.
What this means practically
Don't plan your trip assuming you'll have signal on your phone between stations. Even on lines and segments where cell infrastructure has been installed, coverage can vary by carrier and by exactly where the train is in the tunnel. Stations themselves, especially larger or more recently upgraded ones, are more likely to have reliable signal than the tunnels between them.
Why this trips visitors up
Tourists coming from cities where underground metro systems have had full signal for years, much of London's Underground and most of the Tokyo Metro, for example, sometimes assume the same is automatically true in New York. Getting cut off mid-conversation, or losing your map right when you need to check which stop is next, is a common and avoidable frustration.
How to navigate the subway without relying on live signal
- Download your route before you go underground. Google Maps and Citymapper both let you save transit directions for offline reference.
- Screenshot your route as a backup in case the app itself needs data to display saved directions.
- Note your transfer stations in advance rather than planning to look them up mid-journey.
- Use station-level Wi-Fi where available. Many stations have Wi-Fi even where the tunnels themselves don't have cell coverage, useful for a quick check before you board.
- Tell people you might go quiet. If you're messaging someone about meeting up, let them know you may lose signal for a stretch rather than leaving them wondering why you've gone silent.
What a good eSIM does and doesn't fix
A strong Nycesim.io eSIM plan gives you reliable data everywhere there is signal, on the street, in stations, and increasingly in more subway tunnels as the rollout continues. What it can't do is manufacture signal in a tunnel segment that genuinely has none yet. The fix for that gap is planning ahead, not a different SIM.
Before you head underground
- Save your route offline before entering the station.
- Check whether your specific line has had cell service upgrades, coverage expands over time, so what's true this year may differ from last year.
- Keep your Nycesim.io eSIM active so you have full signal the moment you resurface.
- Build in a little extra time for connections in case you can't check live transit updates mid-journey.