Among smart phone owners who have never engaged with mobile ads, a lack of relevance is the top reason why, according to a July 2012 survey from Hipcricket. 43% of this group said that the ads were not relevant to their interests, while 39% said they did not appeal to them. Other common reasons for not engaging with a mobile ad include concern that it was spam (31%) and uncertainty over the source (21%). Overall, 35% of the mobile owners surveyed said that they have never engaged with a mobile ad. Read the rest at MarketingCharts.