In some countries in Africa, the rise in cell phones has outpaced any rise in landline telephones. Between 1998 and 2008, Africa added only 2.4 million landlines. During this same time the number of mobile phone lines that have been subscribed to has skyrocketed. Between 2000 and 2008, cell phone use has risen from fewer than 2 in 100 people to 33 out of 100. It is more difficult to install landline copper wires to every user, than it is to install mobile wireless towers that people can connect to from anywhere. There has also been substantial decline of landline phones in Indian subcontinent, in urban and even more in rural areas. In the early 21st century, the landline telephone has declined due to the advancement of mobile network technology and the obsolescence of the old copper wire networking. Eventually these metallic networks will be deemed completely out of date and replaced by more efficient broadband and fiber optic landline connections extending to rural areas and places where telecommunication was much more sparse. Some see this happening as soon as the year 2025. In 2004, only about 45% of people in the United States between the ages of 12 and 17 owned cell phones. At that time, most had to rely on landline telephones. Just 4 years later, that percentage climbed to about 71%. That same year, 2008, about 77% of adults owned a mobile phone. In the year 2013, 91% of adults in the United States owned a mobile phone. Almost 60% of those with a mobile had a smartphone. A National Health Interview Survey of 19,956 households by the Centers for Disease Control and Prevention released May 4, 2017 showed only 45.9 percent of U.S. households still had landlines, while 50.8 percent had only cell phones. Over 39 percent had both. In Canada, more than one in five of households use cell phones as their only source for telephone service. In 2013, statistics showed that 21% of households claimed to only use cellular phones. Households that are owned by members under the age of 35 have a considerably higher percentage of exclusive cell phone use. In 2013, 60% of young household owners claimed to only use cell phones. Many of the consumer protections which regulators apply to incumbent landline providers, such as restrictions against cutting off subscribers without notice, do not apply to competing communication services such as cable modems and voice over IP. By means of porting, voice over IP services can host landline numbers previously hosted on traditional fixed telephone networks. VoIP services can be used anywhere an internet connection is available on many devices including Smartphones, giving great flexibility to where calls may be answered and thus facilitating remote, mobile and home working, for example.