Britain is a nation of smartphone addicts,with one in three smartphone users – 11 million UK adults – looking at their device within five minutes of waking up.The waking routine of most smartphone owners now starts with checking who has been in touch with them overnight, according to new research by Deloitte on UK mobile usage habits.Deloitte’s research also shows people can’t leave their phones alone once awake, with about one in six looking at them more than 50 times a day.18-24 year-olds are the most intensive users, checking their device on average 53 times a day and for 13 per cent the figure is more than 100 times.