More email is read on mobile than on a desktop email client. Stats say 48% of email is now opened on a mobile device Litmus –”Email Analytics” (Jan 2015).
The mobile breakdown is as follows: 49.5 percent of email opens were on a smartphone, 16.8 on a tablet. Of the 66 percent of mobile opens, 58 percent happened on an Apple device; 7 percent were on Android devices. (Q4 2014)