This book analyses the social, cultural, technical and economic issues behind the dissimilar growth of information and communications services in countries across the world. There are dissimilarities in terms of service penetration and usage volume between countries with similar socio-economic structures. Penetration and the use of services like voice, messaging and the Internet depend on several factors. This book demonstrates that the socio-cultural aspects of language diversity, technological issues in the service delivery and economic aspects of the charging policy all have major roles to play in the penetration and usage of information and communications services. This book will enable readers from the social sciences and engineering disciplines to appreciate the fundamentals needed in inter-disciplinary and cross-country research on the adoption and growth of communications services. Researchers and managers in business organizations will find the mathematical analysis and tools presented in this book useful for estimating the demand and revenue from next generation networks and services.