OVERLAND PARK, Kan.—Sprint (NYSE: S) and Google (NASDAQ: GOOG) today announced the rollout of Google Wallet to all Nexus S 4G customers – an app that enables consumers to transform their phones into their wallets and make purchases with a simple tap. Sprint is the first carrier and Nexus S 4G is the first phone in the United States to deliver this convenient, innovative service that lets shoppers tap-to-pay at hundreds of ....