Sales at top three local home shopping companies via mobile devices shot up in the first quarter of the year from a year ago, while those based on the Internet and TV were slackening, records from the companies showed Wednesday. Sales at CJ O Shopping Co., formerly known as CJ Home Shopping, from mobile devices rose more than four-fold to 145.3 billion won (US$141.5 million) in the January-March period, compared with 35 billion won a year earlier, the company said.