A survey finds that the average UK smartphone user spends five hours a week online on their mobile phones -- 260 hours and more than 10 days over the space of a year. Of the 2,000 people polled, 40% said they update their social media accounts, such as Facebook and Twitter, 24% check email, and 22% shop. All that Internet usage via smartphone has 22% of respondents watching less TV, but there are other effects, too. Eleven percent say they exercise less.