The growing demand for Wi-Fi technology led to a dramatic rise in sales of Wi-FI equipment in the U.K. over the past year. According to a new study by analyst firm GfK, sales of wireless routers totaled Â£24 million, or an increase of 108 percent from the first quarter of 2005 to the same period in 2006. Also, customers spent Â£13 million on wireless cards, which constitutes a rise of 87 percent in the same period. The research firm said businesses continue to make up the bulk of users of mobile wireless technology, in particularly 3G data cards. Sales of these cards rose by 580 percent with sales amounting to Â£1.7 million.