-
[1] D. Lamey, „The evolution of technology: past, present and future", Discover Tech, 2018 [Online]. Available: http://www.discovertec.com/blog/the-evolution-of-technology(accessed on 2019-11-02)
-
[2] D. Murphy, „2.4 bn smartphone users in 2017, says eMarketer", Mobile Marketing Magazine, 2017 [Online]. Available: https://mobilemarketingmagazine.com/24bn-smartphone-users-in-2017-says-emarketer(accessed on 2019-01-03)
-
[3] „Number of smartphone users worldwide from 2014 to 2020 (In millions)", Statista [Online]. Available: https://www.statista.com/statistics/330695/number-of-smartphoneusers-worldwide/
-
[4] C. Low, „It's no longer enough for budget phones to just be cheap", CES 2017, 2017 [Online]. Available: https://www.engadget.com/2017-01-08-budget-phones-ces-2017.html(accessed on 2019-10-04)
-
[5] „Condiçoes de oferta e de utilizaçao de serviços de comunicaçoes eletrónicas da MEO" [Online]. Available: https://conteudos.meo.pt/meo/documentos/condicoes-oferta-servicos/mod-c1001276.pdf(accessed on 2019-10-25) [in Portuguese]
-
[6] D. Nilsson, „Examples of value added services VAS in Telecom 2017", Appland, 2017 [Online]. Available: https://blog.applandinc.com/examples-mobile-vas-services-vastelecom-2017(accessed on 2019-02-14)
-
[7] „Benchmarks by sector", ACSI [Online]. Available: https://www.theacsi.org/acsi-benchmarks/benchmarks-by-sector accessed on 2019-10-17)
-
[8] D. de Noticias, „Queixas nas telecomunicaßes aumentam para 69 mil", 2017 [Online]. Available: https://www.dn.pt/sociedade/interior/queixas-na-area-das. telecomunicacoes-invertem-tendenciae-aumentam-para-69-milem-2016-7205687.html accessed on 2019-01-04) [in Portuguese]
-
[9] K. Clarke, „Why mobile operators must break free from Bad customer service", Telecom Tech News, 2017 [Online]. Available: https://www.telecomstechnews.com/news/2017/jul/28/whymobileoperators-must-break-free-bad-customer-service/(accessed on 2019-01-05)
-
[10] „Mobile self care apps - customer support benefits for telecoms", 2016 [Online]. Available: https://www.kochartech.com/mobile-selfcare-apps-customer-support-benefits-telecoms/(accessed on 2019-05-05)