The Android smartphone operating system now claims nearly 80 percent of market share, according to the latest Worldwide Quarterly Mobile Phone Tracker report from International Data Corp. Samsung's figure for the second quarter of 2013 (79.3 percent) represents a 10-percent increase year-over-year.

Apple's iOS, meanwhile, claimed 13.2 percent of market share, down from 16.6 percent during 2Q 2012. Windows Phone came in at 3.7 percent, up from 3.1 percent in the same period, while the Blackberry OS fell from 4.9 percent market share a year ago to 2.9 percent in the same period for 2013.

Smartphone market share has important implications for the mobile payments industry. The Samsung Galaxy S4, the company's flagship smartphone that was released in March, is NFC-enabled. Apple's iPhone, on the other hand, has thus far eschewed NFC.

The Galaxy S4 is a strong contributor to Android's overall market share numbers, IDC said, but LG and Chinese vendors Huawei, Lenovo and ZTE each recorded double-digit shipment volumes in the millions. Combined, these vendors accounted for 62.5 percent of all Android-powered smartphone shipments during the quarter.

Overall, vendors shipped 236.4 million smartphones during the quarter, according to the report, up 51 percent over the 156.2 million units shipped in 2Q 2012, and a 9.3 percent increase compared to the 216.3 million units shipped in the first quarter of 2013.

"The iOS decline in the second quarter aligns with the cyclicality of iPhone," Ramon Llamas, research manager with IDC's Mobile Phone team, said in a news release. "Without a new product launch since the debut of the iPhone 5 nearly a year ago, Apple's market share was vulnerable to product launches from the competition. But with a new iPhone and revamped iOS coming out later this year, Apple is well-positioned to re-capture market share."

Apple added new mobile operators to its camp, IDC said, boosting short-term volumes and cementing long-term end-user relationships. What remains to be seen is how the new iOS 7 will be received once it reaches the market later this year, as much of the look and feel of the user interface has been revamped.

Windows Phone is picking up steam, according to Ryan Reith, program manager with IDC's Mobility Tracker programs.

"Last quarter we witnessed Windows Phone shipments surpassing BlackBerry, and the trend has continued into the second quarter," he said in the release. "Nokia has clearly been the driving force behind the Windows Phone platform, and we expect that to continue. However, as more and more vendors enter the smartphone market using the Android platform, we expect Windows Phone to become a more attractive differentiator in this very competitive market segment."

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