Apple alleges Samsung's devices illegally ripped off the iPhone's innovations. After a high-profile trial in federal court, a jury in San Jose, Calif. sided with some of the patent infringement claims last August and decided Samsung should pay more than $1 billion in damages. Samsung has been trying to overturn the verdict.
Lower-priced smartphones from Samsung and other device makers also have hurt Apple, whose slowing iPhone growth has contributed to a $250 billion decline in its market value since its stock price peaked in late September.
IDC says Huawei Technologies Ltd.'s emphasis on less expensive handsets helped it become the third largest smartphone maker with a market share of 5 percent at the end of the fourth quarter.