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After the attack, the cell phone network of New York City was rapidly overloaded as traffic doubled over normal levels.
Cell phone traffic also overloaded across the East Coast, leading to crashes of the cell phone network.
Since three of the major broadcast networks had their transmission towers atop the North Tower ( One World Trade Center ), coverage was limited after the collapse of the tower.
The satellite feed of one station, WPIX, froze on the last image received from the WTC mast ; the image ( a remote-camera shot of the burning towers ), viewable across North America ( as WPIX is available on cable TV in many areas ), remained on the screen for much of the day until WPIX was able to set up alternate transmission facilities.
It shows the WTC at the moment power cut off to the WPIX transmitter, prior to the towers ' collapse.

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