  Telecom industry is significantly evolving all over the globe than ever.
Mobile users number is increasing remarkably. Telecom operators are investing
to get more users connected and to improve user experience, however, they are
facing various challenges. Decrease of main revenue streams of voice calls, SMS
(Short Message Service) and LDC (Long distance calls) with a significant
increase in data traffic. In contrary, with free cost, OTT (Over the top)
providers such as WhatsApp and Facebook communication services rendered over
networks that built and owned by MNOs. Recently, OTT services gradually
substituting the traditional MNOs` services and became ubiquitous with the help
of the underlying data services provided by MNOs. The OTTs` services massive
penetration into telecom industry is driving the MNOs to reconsider their
strategies and revenue sources.
