Reports from the Mumbai train bombings suggest that the "anti-terrorist" limits on cellular networks around the trains (supposed to prevent the movie-plot threat of a terrorist phoning in a more bomb-triggers) actually served to block calls from the victims of the bombings.
Authorities had also severely limited the cellular network for fear it could be used to trigger more attacks.
And:
Some of the injured were seen frantically dialing their cell phones. The mobile phone network collapsed adding to the sense of panic.
As Bruce Schneier says, "Cell phones are useful to terrorists, but they're more useful to the rest of us."
