The idea that a mobile phone is used to make phone calls seems almost quaint. Today, smartphones are replacing not just your address book, iPod, videogame console and navigation system–they are crucial shopping tools that help us find the right restaurant, comparison shop and, increasingly, replace our credit cards, too. The worldwide smartphone market grew nearly 20% in the first quarter alone, and developers are rushing to offer brands new realtime options for driving customer engagement and transactions. Some of the latest reports: Read →