Phones do everything in South Korea.
On a recent reporting trip to the country, I made a point of asking people about interesting ways they use their smartphones.
Some answers weren't too shocking. Lots of people know Koreans use their phones to make purchases (that's a new-ish idea here in the U.S., and one that Google is pushing) and in place of public-transit tickets.
Cab drivers in Seoul give you weird looks if you try to pay with a credit card instead of with a tap of your phone.
But one answer surprised me:
People now use their phones to buy groceries in the subway.
Read "In Seoul, a virtual grocery store in the subway" on CNN's What's Next blog.
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