A quarter of American smartphone owners also use a tablet

"comScore, Inc, a leader in measuring the digital world, today released new insights on the U.S. tablet market from comScore TabLens™, its forthcoming monthly syndicated service providing insights into tablet ownership and usage. The report found that tablets have quickly reached a critical mass in the U.S. with 1 in every 4 smartphone owners using tablets during the three-month average period ending April 2012. The study also found that tablet users were nearly three times more likely to watch video on their device compared to smartphone users, with 1 in every 10 tablet users viewing video content almost daily on their device.
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In just two years since the launch of the iPad, the first tablet to reach a meaningful market penetration, tablet adoption has exploded fueled by the introduction of new devices that appeal to various price and feature preferences. In April 2012, 16.5 percent of mobile phone subscribers used a tablet, representing an increase of 11.8 percentage points in the past year. Growth in market penetration was even more apparent among the smartphone population with nearly 1 in 4 using a tablet device in April, an increase of 13.9 percentage points in the past year. A lower 10.4 percent of feature phone owners use a tablet, suggesting that smartphone ownership is highly predictive of tablet adoption in the current market.
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A demographic analysis of mobile device audiences indicated that tablet and smartphone audiences closely resemble one another in terms of gender composition, with tablet users just slightly more likely to be female than smartphone users. However, the age composition of audiences showed that tablet users skewed noticeably older than smartphone users. For both devices, the heaviest overall audience concentration was between the ages of 25-44. Compared to smartphone owners, tablet users were 28 percent more likely to be in the 65 and older age segment, and 27 percent less likely to be age 18-24.
Tablet users also skewed towards upper income households, likely a function of the high price point of these devices still considered a luxury good to many consumers. Nearly 3 in 5 tablet users resided in households with income of $75,000 or greater, compared to 1 in every 2 smartphone users."
Source:  Data from comScore MobiLens, reported in a press release, 8th June 2012