share: digg facebook twitter Retailers are betting that selling their wares on a device that people carry around all day can encourage Americans to spend money during an economic downturn in which they're making fewer impulse buys in their bricks-and-mortar stores. The average user spends 81 minutes a day using mobile apps, more time than is spent Web browsing on a computer or other device, according to mobile analytics firm Flurry. [...] smartphone users are spending most of their time playing games, checking social networks, taking video, accessing maps and getting sports scores, according to digital research firm comScore. Less than a third of retailers polled by the National Retail Federation in May said they have a fully implemented mobile strategy, which might include an application available for download by iPhone, Droid and Blackberry users. [...] Sara Margulis, who runs an online wedding gift registry in Sonoma County, Calif., uses her iPhone to buy books and diapers on Amazon, but sticks to her home computer for the majority of her electronic purchases in part because she likes the larger screen. Overall, she says, it will take some time for Americans to fully embrace mobile shopping — just as they did with online shopping. Target, Best Buy, American Eagle Outfitters and others are boosting sales with a third-party mobile application called Shopkick that gives customers special offers anytime they step into their stores. [...] inside Home Depot, a shopper can launch the store's app and get more information about a lawn mower or other item without having to ask a salesperson.