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2. https://www.ericsson.com/en/mobility-report/reports/june-2020/mobile-subscriptions-outlook
3. Wang Y, Chen IR, Wang DC (2015) A survey of mobile cloud computing applications: perspectives and challenges. J Wirel Pers Commun 1607–1623
4. https://www.bankmycell.com/blog/how-many-phones-are-in-the-world
5. https://www.statista.com/statistics/330695/number-of-smartphone-users-worldwide