The Universal Mobile Telecommunication System (UMTS) is a third generation (3G) mobile communications system that provides a range of broadband services to the world of wireless and mobile communications. The UMTS delivers low-cost, mobile communications at data rates of up to 2 Mbps. It preserves the global roaming capability of second generation GSM/GPRS networks and provides new enhanced cap...

Mobile service providers (MSPs) are particularly vulnerable to roaming frauds, especially ones that exploit the long delay in data exchange process of contemporary management systems, causing multi-billion dollars loss each year. In this paper, we introduce BlockRoam, a novel blockchain-based system provides an efficient platform among MSPs and mobile subscribers. Utilizing Proof-of-Stake (PoS)...

Activity recognition aims to automatically determine what people do from a series of observations. With several billion subscribers and multiple sensors, the mobile phone is an obvious opportunity for activity recognition. We give an overview of mobile-phone-based activity recognition along two directions – recognised activities and inference techniques. We show that existing systems can be cla...

The ever-increasing demand of mobile system is posing a great challenge for efficient call delivery due to tremendous surge in numbers of mobile subscribers. In order to scale well with increased users, the efforts are underway to develop the new location management techniques as well as to optimize the existing ones so as to keep up-to-date information about current location of mobile phones w...

In-network observation and control of mobile objects via static wireless sensors demands consistent, timely information. In this paper, we present two wireless network (WSN) services that support such observation and control: Trunk provides a global snapshot of the locations of all mobile objects at well-known times to all innetwork subscribers, and Trail provides the location of a particular m...

Mobile number portability (MNP) means that customers using mobile service can retain their telephone numbers when they change operators. Mobile carriers are concerned about which factors influence willingness to churn of customers. This study examined these concerns through three steps. The first is checking whether willingness to churn between the different situations, without MNP and with MNP...

The mobile (wireless) service market has been rapidly growing along with the development of a variety of wireless applications and services and the increasing number of mobile Internet users. In this rapidly changing market environment, understanding users’ satisfaction with mobile Internet service, the dimensions of service quality, and their intentions to use current service is important to b...

Turkey has started to distribute Global Services of Mobile (GSM) 900 licences in 1998. Turkcell and Telsim have been the first players in the GSM market and they bought licenses respectively. In 2000, GSM 1800 licenses were bought by ARIA and AYCELL respectively. After then, GSM market has saturated and customers started to switch to other operators to obtain cheap services, number mobility bet...

Recent work has shown that cell phone mobility data the unique potential to create accurate models for human and consequently spread of infected diseases [74]. While prior studies have exclusively relied on a mobile network operator’s subscribers’ aggregated in modelling disease dynamics, it may be preferable contemplate individuals only. Clearly, naively linking with health records would viola...