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CTIA. (August 30, 2020). Number of smartphones in active use in the United States from 2009 to 2019 (in millions) [Graph]. In Statista. Retrieved June 20, 2021, from https://www.statista.com/statistics/800990/smartphones-in-active-use-in-the-united-states/
CTIA. "Number of smartphones in active use in the United States from 2009 to 2019 (in millions)." Chart. August 30, 2020. Statista. Accessed June 20, 2021. https://www.statista.com/statistics/800990/smartphones-in-active-use-in-the-united-states/
CTIA. (2020). Number of smartphones in active use in the United States from 2009 to 2019 (in millions). Statista. Statista Inc.. Accessed: June 20, 2021. https://www.statista.com/statistics/800990/smartphones-in-active-use-in-the-united-states/
CTIA. "Number of Smartphones in Active Use in The United States from 2009 to 2019 (in Millions)." Statista, Statista Inc., 30 Aug 2020, https://www.statista.com/statistics/800990/smartphones-in-active-use-in-the-united-states/
CTIA, Number of smartphones in active use in the United States from 2009 to 2019 (in millions) Statista, https://www.statista.com/statistics/800990/smartphones-in-active-use-in-the-united-states/ (last visited June 20, 2021)
