89.6 million Americans used their mobile phone to access email for work or personal purposes during the three-month average period ending November 2011, growing 28% from the previous year and representing an additional 19.5 million mobile email users. In November, nearly 2 of every 5 mobile users in the U.S. used email (both smartphone and non-smartphone users), with penetration much higher among just smartphone owners at 78%.
Analysis of the frequency of mobile email usage found that the majority of users accessed email almost every day from their mobile device, representing 64% of mobile email users, with this segment showing the largest audience growth in the past year with a 33% increase.
