The literature review has been required for the estimation of assisting and impeding factors to the mobile telecom revenue modifications. The different industry-related resources clarified the reason of mobile revenue stream reduction from the global outlook, and the mobile operators’ efforts toward the revenue deterioration through new revenue streams’ realizations. The global overview can facilitate the projection of Azercell horizons by mitigating the negative impacts caused by different factors and sustaining revenue
through new streams. For the evaluation and finding of the required information, the literature review was estimated through below indicated parameters. (Mark Saunders, Philip Lewis, and Adrian Thornhill 2009), (Uma Sekaran, Roger Bougie, 2010)
Table 6. Literature evaluation
