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Mobile Minutes: Vertical video; Apple malware; Samsung Pay; Click fraud

Watching video vertically is so popular on mobile phones that one production company here just built a new vertical kitchen.

Apple Inc said the WeChat messaging app and car-hailing app DiDi Taxi were among the 25 most popular apps found to be infected with malicious software. Apple had previously not disclosed which apps had been affected, although many had been identified by third parties.

Just in time for its U.S. launch next week, Samsung Electronics Co. said that its new mobile payment service has processed more than $30 million worth of transactions in its first month in South Korea, a level of market adoption that the company said was ?beyond our expectations.?

Marketers thought the Web would allow perfectly targeted ads. ?Hasn?t worked out that way.