Android and Apple dominate in smartphones, with 85 per cent of the worldwide market combined in the quarter.
Blackberry devices, meanwhile, came a distant third with 4.8 per cent of the market, compared to 11.5 per cent a year earlier.
Waterloo, Ont.-based Research In Motion, once Canada's high-tech heavyweight, has been working to turn around its operations as consumers switch to iPhones and smartphones running the Android operating system.
The company's future success rides on the unveiling of its BlackBerry 10 operating system and new phone.
But BB10 has suffered two major delays that have pushed its debut into early 2013, while Apple's new iPhone hits store this Friday.
LG Electronics says its Optimus G Android smartphone will launch next week in South Korea.
Other companies making Android devices include Samsung Electronics Co., HTC Corp. and Motorola Mobility, which Google now owns.
Here are IDC's figures for worldwide smartphone unit sales and market share in the second quarter of 2012, by operating system.
- Android (Google Inc.): 104.8 million units, 68.1 per cent share (46.9 per cent a year earlier)
- iOS (Apple Inc.'s iPhone): 26 million units, 16.9 per cent share (18.8 per cent a year earlier)
- BlackBerry (Research in Motion Ltd.): 7.4 million units, 4.8 per cent share (11.5 per cent a year earlier)
- Symbian (mostly used by Nokia Corp.): 6.8 million units, 4.4 per cent share (16.9 per cent a year earlier)
- Windows (Microsoft Corp.): 5.4 million units, 3.5 per cent share (2.3 per cent a year earlier)
- Linux: 3.5 million units, 2.3 per cent share (3.0 per cent a year earlier)
- Others: 0.1 million units, 0.1 per cent share (0.5 per cent a year earlier)