This document provides a high-level overview of mobile payments. It discusses different examples of mobile payment systems around the world, including Square in the US, McDonald's Club in Japan, M-PESA in Kenya, and a partnership between Barclaycard and Orange in the UK. It also outlines different business models for mobile wallets, including operator wallets controlled by mobile carriers and platform or cloud-based wallets. The document aims to illustrate the current state of the mobile payments industry and different approaches being used globally.