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Taiwan had the highest mobile phone usage in 2005 at 111 subscribers per 100 people.[2]. Hong Kong has the highest mobile phone penetration rate in the world, at 127.4% in June 2006.[2] The total number of mobile phone subscribers in the world was estimated at 2.14 billion in 2005.[3]. Around 80% of worlds population have mobile phone coverage as of 2006. This figure is expected to increase to 90% by the year 2010.[4] At present, Africa has the largest growth rate of cellular subscribers in the world.[5] African markets are expanding nearly twice as fast as Asian markets.[6] The availability of Prepaid or pay as you go services, where the subscriber does not have mit to a long term contract, has helped fuel this growth on a monumental scale, not only in Africa but on other continents as well. All European nations and most Asian and African nations have adopted GSM. In other countries, such as the United States, Australia, Japan, and South Korea, legislation does not require any particular standard, and GSM coexists with other standards, such as CDMA and iDEN. In fewer than twenty years, mobile phones have gone from being rare and expensive pieces of equipment used by businesses to a pervasive low-cost personal item. In many countries, mobile phones now outnumber land-line telephones, with most adults and many children now owning mobile phones . In the United States, 50% of children own mobile phones.[3] It is not mon for young adults to simply own a mobile phone instead of a land-line for their residence . In some developing countries, where there is little existing fixed-line infrastructure, the mobile phone has e widespread. According to the CIA World Factbook the UK now has more mobile phones than people [4]. With high levels of mobile telephone penetration, a mobile culture has evolved, where the phone es a key social tool, and people rely on their mobile phone address book to keep in touch with their friends. Many people keep in touch using SMS, and a whole culture of texting has developed from this. mercial market in SMSs is growing. Many phones even offer Instant Messenger services to increase the simplicity and ease of texting on phones. Cellular phones in Japan, offering Internet capabilities such as NTT os i-mode, offer text messaging via standard e-mail. The mobile phone itself has also e a totemic and fashion object, with users decorating, customizing, and accessorizing their mobile phones to reflect their personality. This has emerged as its own industry. The sale mercial ringtones exceeded $2.5 billion in 2004 [5]. Mobile phone etiquette has e an important issue with mobiles ringing at funerals, weddings, movies, and plays. 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