Book excerpt: Companies and whole branches of industry have a social and ecological responsibility. Excessive use of resources and exploitation of workers throw a negative light on certain branches of industry. One example for such an industry is the mobile phone sector. In order to solve this problem, Frederik Meissner presents a case study of two sustainable business models. How do companies propose, create, deliver, and capture value? Do the discussed business models correspond to the principles of the circular economy? The circular economy is seen as a condition and a beneficial relation for sustainability. Meissner’s first case is the smartphone retailer Fairphone, who provides a long-living, modular, and transparent mobile phone. The second case is Mazuma Mobile, a refurbishment service that provides second-hand mobile phones and the possibility to sell an old or broken electronic device. This book shows how a company can produce and deliver products using sustainable methods. In this book: - Business Model Canvas; - Technical Cycle; - Nine Building Blocks; - Value Creation; - Value Capturing