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Lightning strikes have injured and even killed people who were talking on the telephone. In 1998, a nine-year-old girl was jolted by a lightning strike as she talked on a corded telephone in the family home in Columbus, Ohio.
However, cell phones (and cordless portable phones) used indoors during electrical storms are perfectly safe because there is no wire through which the electrical discharge could travel.
Discover more about lightning and lightning safety in JetStream - An Online School for Weather.