If you have been inside Walmart in Crossville the past few days, you have seen changes to the self checkout areas. Walmart is expanding a test of their Mobile Express Scan & Go app to an additional 100 Walmart stores across the nation, including the store in Crossville. The app allows customers to scan and bag items, including produce, while they shop and pay directly with their phones. Company officials say there will be no waiting in line at the register using the express scan and go system. When customers launch the app, it automatically lists participating stores nearby. The app is available on both Android and iOS devices and, just like shopping with Walmart Pay, it securely stores credit or debit card information for fast and easy checkout. Once customers are done shopping and have paid for their items, they simply walk through the Mobile Express lane on their way out. Officials say not only does Scan & Go save time by letting people skip the register, it also helps make staying on budget easier. Customers see the price of individual items as they scan them along with a running total. As part of the test, some Walmart stores, including the Crossville store, have been outfitted with Scan & Go kiosks where customers can pick up easy-to-use handheld devices. This allows them to try out the service before downloading it to their phones. Company officials say the number of regular checkouts manned by a cashier is down to just over a dozen after making room for the mobile express scan and go.