Overall sales of mobile devices to end users totalled 428.7 million units in the second quarter this year, up 16.5 percent from the same period in 2010, said Gartner, an industry research firm based in the U.S., in a report released Thursday, Sina.com reported Friday.

According the report, Nokia sold 97.87 million phones, compared to 111.5 million in the second quarter of 2010. Its market share dropped from 30.3 percent to 22.8 percent. Samsung's market share fell from 17.8 percent to 16.3 percent. LG's overall share slid from 8 percent to 5.7 percent. Apple came in fourth, going from 2.4 percent to 4.6 percent. ZTE has become the fifth largest phone maker in the world, its market share growing from 1.8 percent to 3.0 percent.

"We expect manufacturers and distributors to remain cautious about raising their stock levels in the second half of 2011, following the recent uncertainty on the world financial markets," said Gartner analyst Annette Zimmermann.

The industry research company also expects the overall market of mobile devices to grow by 12 percent in 2011.