The latest comScore data shows consistent growth in US smartphone penetration. The rate is now 58.4 per cent of adult consumers who own phones. This is up from 20 per cent only three years ago. The rate of growth remains a remarkable 1.2 per cent per month. That’s 700,000 new-to-smartphone users every week. The historic average over 3 years has been 1.07per cent per month This after having crossed over 50 per cent on schedule in August 2012. There appears to be no slowing.