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IDC. (February 24, 2017). Forecast growth of wireless voice telecom spendings worldwide from 2015 to 2020 [Graph]. In Statista. Retrieved May 07, 2021, from https://www.statista.com/statistics/511514/worldwide-wireless-voice-telecom-spending-growth/
IDC. "Forecast growth of wireless voice telecom spendings worldwide from 2015 to 2020." Chart. February 24, 2017. Statista. Accessed May 07, 2021. https://www.statista.com/statistics/511514/worldwide-wireless-voice-telecom-spending-growth/
IDC. (2017). Forecast growth of wireless voice telecom spendings worldwide from 2015 to 2020. Statista. Statista Inc.. Accessed: May 07, 2021. https://www.statista.com/statistics/511514/worldwide-wireless-voice-telecom-spending-growth/
IDC. "Forecast Growth of Wireless Voice Telecom Spendings Worldwide from 2015 to 2020." Statista, Statista Inc., 24 Feb 2017, https://www.statista.com/statistics/511514/worldwide-wireless-voice-telecom-spending-growth/
IDC, Forecast growth of wireless voice telecom spendings worldwide from 2015 to 2020 Statista, https://www.statista.com/statistics/511514/worldwide-wireless-voice-telecom-spending-growth/ (last visited May 07, 2021)
