This is Sensorly, an App for Android which can help you find what you want: 4G connectivity.

It does this using crowdsources data as well as using information from other users in order to put all of this information into a map.

As you can see, there is a map here with some green area in the New York area to show where the hotspots actually are.

I suppose that there will come a day when the green will dominate the map, but today isn’t that day.

Source

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