According to a report from Knotice, the number of emails opened on a mobile device — a smartphone and/or tablet — during the first half of 2012 overall rose to 36 percent. This is a 32 percent increase over the former mobile email open rate of 27 percent from the second half of 2011. Knotice found that email engagement by phone is significantly higher in the 90 minutes after an email is sent, with negligible differences between phone, tablet and desktop device use after approximately five hours. Consumer Services and Financial Industries saw the highest mobile open rates, 42.17 percent and 40.13 percent respectively.
