Apple is expected to get a big boost when its latest smartphone starts selling in China later this quarter, RBC Capital said. China Mobile (CHL), the world's largest mobile operator with 699 mil subscribers, is expected to start selling iPhones in early '13 but for now has no agreement with Apple (AAPL). China Unicom (CHU), China's 2nd-largest mobile carrier, expects to begin selling iPhone 5s this year. Chinese authorities are concluding tests on it. China Unicom shares fell 0.4% to 15.39; China Mobile rose 0.1% to 55.59.