Mobile email open rates in the consumer services, hospitality and financial services industries all passed 50 percent in the second half of 2013, according to a new report from Knotice. The report, which analyzed 1 billion emails in the second half of 2013, also revealed that across industries the number of emails opened on a mobile device increased to 48 percent by the end of 2013. This represents a 33 percent spike over the second half of 2012.