As this competition intensifies, it's going to be a hard sell to convince people to store their credit and debit cards, cash, loyalty cards and coupons on an electronic device such as their smartphone, according to a Gallup Panel Web study.

Among the study's findings are that engaged customers are more likely to use a digital wallet everywhere, and digital wallet users want to feel special. But right now there aren't very many of them.

While 13 percent of U.S. adults have a digital wallet on their smartphone, 76 percent of those people have either never used it or almost never used it to make a purchase in the last 30 days, according to the Gallup Business Journal. Of the U.S. consumers who use a digital wallet, men and millennials use it more than other people, with 11 percent of men and 11 percent of millennials using it every time, or almost every time, to make a purchase.

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