The report was based on March data from the 1.6 billion mobile devices Flurry Analytics tracks.
To simplify the analysis, the researchers focused on the top 875 devices, which accounted for 87% of sessions in March 2015. The devices were categorized as small phones (3.5" screen size and less), medium phones (3.5" - 4.9"), phablets (5" - 6.9"), small tablets (7" - 8.4"), and large tablets (8.5" and more).
In January 2014, phablets accounted for only 6% of the devices tracked; in March 2015, that share more than tripled—to 20%.
That growth came mostly at the expense of medium phones, which lost 9% share in the past year. Full-size tablets and small phones also suffered losses in share; small tablets held their ground at 7%.
Some 36% of active Android devices in March 2015 were phablets, compared with only 4% of iOS devices.
Since the launch of the iPhone 6 and iPhone 6 Plus (which is classified as a phablet in the report), there have been 2.75 times more iPhone 6s than 6 Pluses activated, the analysis found.
About the research: The report was based on March data from the 1.6 billion mobile devices Flurry tracks.