104 страниц. 2013 год. LAP Lambert Academic Publishing A survey by ERICSON ( one of top tier infrastructure suppliers for mobile networks) in July 2010 shows that there are approximately 0.5 billion smart phones in the globe. This survey estimates 3.4 billion smart phone users in 2015. Thus, the Internet service providers must deliver a high quality of service to the customers who are using latest devices like smart phones, personal digital assistants, mobile enabled laptops such as Windows Mobile and the Windows Phone.