According to eMarketer:

“A February 2017 survey of U.S. smartphone users conducted by Euclid Analytics found that respondents ages 16 to 21 (Generation Z) use their devices for many reasons while shopping in-store. When Euclid asked respondents about how they use their smartphones in stores, 16- to 21-year-olds were more likely than consumers on average to use the devices for general purposes, to take pictures of products for future reference, and to talk or chat with friends or family about purchases. There were only two areas in which they lagged average users. One was using their smartphone to compare prices, and the other was email promotions.”