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Gallup. (July 9, 2015). How often do you use your smartphone, including times you look at it, check it, or use it for any reason?* [Graph]. In Statista. Retrieved June 21, 2021, from https://www.statista.com/statistics/478777/smartphone-use-frequency-us-by-age/
Gallup. "How often do you use your smartphone, including times you look at it, check it, or use it for any reason?*." Chart. July 9, 2015. Statista. Accessed June 21, 2021. https://www.statista.com/statistics/478777/smartphone-use-frequency-us-by-age/
Gallup. (2015). How often do you use your smartphone, including times you look at it, check it, or use it for any reason?*. Statista. Statista Inc.. Accessed: June 21, 2021. https://www.statista.com/statistics/478777/smartphone-use-frequency-us-by-age/
Gallup. "How Often Do You Use Your Smartphone, including times You Look at It, Check It, or Use It for Any Reason?*." Statista, Statista Inc., 9 Jul 2015, https://www.statista.com/statistics/478777/smartphone-use-frequency-us-by-age/
Gallup, How often do you use your smartphone, including times you look at it, check it, or use it for any reason?* Statista, https://www.statista.com/statistics/478777/smartphone-use-frequency-us-by-age/ (last visited June 21, 2021)
