No more waiting on long checkout lines, Walmart says. That’s because in dozens of its stores, customers can use their iPhones to scan products as they shop and pay at a self-checkout. “Your shopping experience has just been upgraded,” Walmart writes in promotional materials. Scan & Go lets users scan their groceries with their iPhones, and “then quickly pay at the self-checkout registers and you’re out the door.” The app is currently compatible ...

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