Mobile telecommunication diffusion has been studied generally in a number of recent papers (Grajek and Kretschmer, 2009; Jang et al., 2005; Botelho and Pinto, 2004; Lim et al., 2003; Gruber 2001; Gruber and Verboven, 2001) but only a few of them focus on developing countries (e.g., Singh, 2008) or, especially, on comparing the diffusion in developed and developing countries (Rouvinen, 2006). However, there are some studies that report different patterns and types of use of mobile phones in low-income economies compared to high-income economies (e.g., Hahn and Kibora, 2008; James and Versteeg, 2007). Moreover, the magnitude of this innovation may be greater in geographic areas,where the fixed telephone provision has a very limited presence or is technically unreliable (Hahn and Kibora, 2008). Thus, the diffusion of mobile telecommunications may exhibit very different features in the least developed or developing countries compared to developed countries.