Six in ten people around the world now have cell phone subscriptions, signaling that mobile phones are the communications technology of choice, particularly in poor countries, according to a U.N. report published Monday. By the end of last year there were an estimated 4.1 billion subscriptions globally, compared with about 1 billion in 2002, the International Telecommunication Union said. Fixed line subscriptions increased at a much slower pace to 1.27 billion from about 1 billion over the same period.