Apple’s iPhone gained more ground in the worldwide smartphone market year-over-year, with shipment volume growth coming from Asia/Pacific and Japan, according to the IDC research (http://www.idc.com).

As of the fourth quarter of 2010, Apple had 16.1% of market share shipping 16.2 million iPhones. That compares to 16.1% and 8.7 million units shipped in the fourth quarter of 2009. That’s 86.2% growth. Nokia leads the market with 28% market share and 28.3 million units shipped in the fourth quarter of 2010.

In addition, Apple made further inroads into the enterprise market, with more companies adding Apple to their approved smartphone list and increased development of corporate-centered applications. Rumors of an iPhone 5 have begun to heat up the blogosphere, with many expecting a new design and perhaps a mobile wallet, says IDC.

According to the “IDC Worldwide Quarterly Mobile Phone Tracker,” vendors shipped a total of 100.9 million smartphones during the fourth quarter of 2010 (4Q10), up 87.2% from the 53.9 million smartphones shipped during 4Q09. For the full year, vendors shipped a total of 302.6 million smartphones worldwide, up 74.4% from the 173.5 million smartphones shipped in 2009.