Looking for a PBX system that uses cell phones as extensions.

The table shows the estimated percentage P of the population of Europe that uses cell phones?

• The table shows the estimated percentage P of the population of Europe that uses cell phones. (Midyear estimates are given.) Year: 1998 1999 2000 2001 2002 2003 P: 28 39 55 68 77 83 (Respectively to the year) (a) Find the average rate of cell phone growth between each pair of years. 2001 to 2003 2001 to 2002 2000 to 2001 (b) Estimate the instantaneous rate of growth in 2001 by taking the average of the last two rates of change in part (a).

• Answer:

  This is a list of countries by the number of mobile phones in use, mostly based on The World Factbook.[1] Rank ↓ Country/Region ↓ Number of mobile phones ↓ Population ↓ % of Population ↓ Date of Information ↓ — Flag of World World 3,665,000,000 6,671,266,000 54.9 Jun 2008 1 Flag of the People's Republic of China China 641,000,000 1,323,758,000 48.5 Dec 2008 [2] — Flag of Europe European Union 466,000,000 497,198,740 93.7 2005 2 Flag of India India 362,200,000 1,157,965,582 31.2 Jan 2009[3] 3 Flag of the United States United States 260,000,000 303,403,000 85.7 March 2008[4] 4 Flag of Russia Russia 172,000,000 141,947,000 121.2 Dec 2007 5 Flag of Brazil Brazil 151,900,000 189,987,291 79.7 Jan 2009[5] 6 Flag of Indonesia Indonesia 115,600,000 231,627,000 49.9 2008[6] 7 Flag of Japan Japan 102,980,000 127,790,000 79.6 April 2008[7] 8 Flag of Germany Germany 101,500,000 82,210,000 123.5 2008[8] 9 Flag of Pakistan Pakistan 90,525,557 162,474,000 56.20 Oct 2008[9] 10 Flag of the United Kingdom United Kingdom 70,000,000 60,975,000 116.0 2007[10] 11 Flag of Mexico Mexico 76,000,000 106,535,000 71.0 Aug.2008 12 Flag of Italy Italy 71,500,000 59,337,888 120.5 2005 13 Flag of the Philippines Philippines 63,803,000 88,703,200 71.6 Feb. 2008 14 Flag of France France 53,023,000 64,473,140 82.2 2006 15 Flag of Turkey Turkey 52,663,000 70,586,256 74.6 2006 16 Flag of Thailand Thailand 50,000,000 65,000,000 78.5 2008 17 Flag of Ukraine Ukraine 49,976,000 46,398,114 107.7 2006 18 Flag of Spain Spain 46,152,000 45,200,737 102.1 2006 19 Flag of South Korea South Korea 43,500,000 48,224,000 90.2 2007 20 Flag of Argentina Argentina 40,402,000 40,482,000 99.8 2007 21 Flag of Bangladesh Bangladesh 40,340,000 158,665,000 25.4 2008 22 Flag of South Africa South Africa 39,660,000 47,850,700 82.9 2006 23 Flag of Iran Iran 39,400,000 71,208,000 54.2 2008 24 Flag of Poland Poland 36,746,000 38,115,967 96.4 2006 25 Flag of Vietnam Vietnam 33,200,000 87,375,000 38 2007 26 Flag of Nigeria Nigeria 32,322,000 148,093,000 21.8 2006 27 Flag of Colombia Colombia 29,763,000 44,068,000 67.5 2006 28 Flag of Algeria Algeria 28,500,000 33,858,000 92 2006 29 Flag of Venezuela Venezuela 27,400,000 28,200,000 98.0 2008 30 Flag of the Republic of China Taiwan 23,249,000 22,958,000 101.3 2006 31 Flag of Romania Romania 22,800,000 21,438,000 108.5 March 2008 32 Flag of Morocco Morocco 20,029,000 34,343,000 58.4 2007 [11] 33 Flag of Australia Australia 19,760,000 21,179,211 93.3 2006 34 Flag of Saudi Arabia Saudi Arabia 19,663,000 24,735,000 79.5 2006 35 Flag of Malaysia Malaysia 19,464,000 27,484,000 70.8 2006 36 Flag of the Netherlands Netherlands 18,914,000 16,402,414 115.3 Sept. 2007 [12] 37 Flag of Egypt Egypt 18,001,000 75,498,000 23.8 2006 38 Flag of Peru Peru 19,000,000 27,000,264 70.0 Nov. 2008 39 Flag of Canada Canada 17,017,000 33,177,900 51.3 2005 40 Flag of Chile Chile 15,768,000 16,598,074 95 July 2008 41 Flag of Portugal Portugal 12,226,000 10,632,000 115.0 2006 42 Flag of New Zealand New Zealand 4,245,000 4,173,460 101.7 2006 [13]