Google's Android operating system edged ever closer to 50 percent market share in the U.S. in the past three months, capturing 48.6 percent of the market by the end of January.
That's a 2.3 percent jump from October, according to Tuesday data from comScore. The release of the iPhone 4S, meanwhile, helped boost Apple's iOS market share by 1.4 percent to 29.5 percent of the U.S. market.
Research in Motion, however, took a 2 percent dip to 15.2 percent, followed by Microsoft's Windows Phone, which dropped 1 percent to 4.4 percent, and Symbian, which sagged just 0.1 percent to 1.5 percent.
The boost for Android and iOS came as the number of smartphone subscribers in the U.S. jumped passed 100 million in January, up 13 percent from October.
In terms of handset makers, Samsung remained number one with 25.4 percent of the market, though that was a very slight 0.1 percent drop from October. LG and Motorola rounded out the top three with 19.7 percent and 13.2 percent of the market, respectively.
Apple, which came in at number four, was the only handset maker to pick up market share among OEMs, jumping 2 percent to 12.8 percent of the U.S. market. That shouldn't come as a complete surprise since Apple shipped an astounding 37 million iPhones during the fourth quarter, thanks in large part to the October release of the iPhone 4S.