In a letter to the British Medical Journal the docs write that if someone is holding a phone when struck by lightining they risk greater injury or death than they would otherwise, because the phone disrupts the "flashover effect." This means that the charge is not conducted over skin as quickly as it would normally be.
What is not really clear -- to me at least -- is if phones actually increase the chances of being struck. Some of the cases cited seem to be people in places that already have a greater chance of a hit, such as the wide open spaces of a park.
Or maybe Zeus doesn't like obnoxious cellphone talkers, either.
— Dan Jones, Site Editor, Unstrung