Supersized smartphones have been increasing in popularity for quite some time, but IDC now believes that they've truly hit the mainstream. The analyst group estimates that about 21 percent of the 261.1 million smartphones shipped in the third quarter had displays five inches or larger; that's a huge jump from just three percent a year earlier. An influx of big flagships like the Galaxy S 4 and G2 no doubt played a major role in the growth. However, IDC notes that the average price of a large-screened phone has dropped by 22.8 percent in one year -- those shipments included a wave of lower-cost behemoths like the Ascend Mate and Galaxy Mega 6.3.
IDC is also estimating market share for the quarter (shown after the break), although it's painting a familiar picture. Android now has more than 80 percent of the market, while iOS is treading water at 12.8 percent. Windows Phone grew quickly as well, climbing from two percent in Q3 2012 to 3.6 percent a year later. The fourth quarter may be a different story, however -- Nokia is getting into the giant handset game with the Windows Phone-based Lumia 1520 and 1320, while Apple is enjoying brisk sales of its recently launched (if relatively small) iPhone 5s. We won't be shocked if Google's mobile rivals grab a larger slice of the market.