The following text is from Apple, but it’s true in every aspect!

Embark NYC Subway makes it easy to get around New York. Embark even works without cellular signal!

Features:
– Offline trip planning between subway stations
– Interactive MTA Subway map
– Directions to any address or landmark (internet connection required)
– Tap any station to see upcoming scheduled trains & a street map
– Bookmark a station to save it
– Current delays and diversions
– Push alerts for delays customized to your routes
– Share your trip via Email, SMS or Twitter

For a long time HOPSTOP was the best New York City iPhone subway app, but now it’s embark NYC!

You’ll find it here:

https://itunes.apple.com/us/app/embark-nyc-subway-new-york/id450991137?mt=8

If this link doesn’t work in your country – search for “embark NYC” in iTunes!