Reuters reports that Walmart is expanding its iPhone-based Scan & Go self-checkout system to over 200 of its stores, up from 70 currently. The company began pilot testing on the project, which allows users to scan items into an iPhone app as they shop and then easily pay for their items at a checkout station as they leave the store, last August.For now, "Scan & Go" only works on Apple Inc devices. An Android version should be out soon, Walmart said. With more than half of its shoppers using smartphones, Walmart is trying to make shopping more convenient for shoppers who embrace mobile technology. More than half of the customers who have tried the "Scan & Go" feature have used it more than once, [Walmart senio
