The movie \"Cellular\" was named in honor of mobile telefonchika, who became the only hope for salvation from the hands of the killer. Jessica was abducted and locked, but to a great happiness when it turned out to be barely working cell.
Casual young man named Ryan, to which she made a call turned out to be a normal guy and decided to come to the rescue. Just say where she she could not and the battery in the phone sets. Ryan have enough grey matter to untangle the situation and rescue the hostage, see for yourself.