A survey by IDC showed global smartphone sales of 355.2 million in the July-September period, up 6.8 percent from a year ago and the second highest quarterly total on record.
Samsung remained the top vendor, delivering 84.5 million handsets or 23.5 percent of the total market, followed by Apple's 48 million which gave the US firm 13.5 percent.
China's Huawei cemented its hold on third place with a 7.5 percent market share and 26.5 million units, followed by Chinese rivals Lenovo and Xiaomi, which each captured slightly more than five percent.
Apple this year began these strategies to entice buyers for its high-end iPhones.
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"The vendor landscape and product offerings are really unique at the moment as many markets are seeing consumers become more aware of alternative buying options when it comes to paying for their smartphone," said IDC's Ryan Reith.
"In mature and subsidized markets, we now have a wide range of operators offering equipment installation plans), as well as early trade-in options. At the same time the number of unlocked/off-contract offerings has increased significantly and it's slowly starting to resonate with consumers."
"The third quarter placed a substantial emphasis on flagship devices as vendors tried to outclass each other in both features and design," said IDC research manager Anthony Scarsella.