The iPhone delivered click-through rates on ads 35% better than the average compared to gaming devices and rival smartphones like the BlackBerry and Android-powered handsets, according to a new study by mobile ad network Quattro Wireless. In addition to device type, the research — based on the 4 billion ads per month served on the Quattro network in the second quarter — also looked at response rates across criteria including ad type and industry sector and brands. The study used indices in which 100 is the average and performance is judged below or above that figure. So the iPhone had an index of 135, followed by gaming devices at 105. Other phones had below-average click-through rates, with Palm devices at 79, Android phones at 66, and BlackBerry at 62. Read more at www.mediapost.com