The Philippines has passed a law that requires mobile phone companies to send early warnings to millions of people in the path of deadly typhoons, volcanic eruptions and earthquakes in an effort to reduce high number of fatalities that occur almost every year. The measure was in response to one of the deadliest typhoons ever to make landfall — Typhoon Haiyan, which killed over 6,300 people and displaced 4 million in the central Philippines last year. The Free Mobile Disaster Act, which was signed last week by President Benigno Aquino III but announced only on Friday, directs mobile phone operators to send out alerts about storms, tsunamis or other calamities whenever required by national disaster agencies. Similar early warning systems are in place in several other countries, including Japan. The Philippines is hit by about 20 typhoons a year in a region that generates some of the world's strongest tropical cyclones.