NEW YORK - New Yorkers could soon see straphangers using cellphones, tablets and other devices while riding underground.

MTA Chairman Tom Prendergast says he envisions Wi-Fi and cellphone service will eventually be expanded throughout the city's entire transit network.

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Cellphone signals and wireless connections are currently only available on some platforms, mezzanines and at about three dozen underground subway stops, but it has not yet reached the trains themselves.

There's no official date set for when the entire network could be expanded, but 40 subway stations are on track to receive Wi-Fi in 2017.