BEIJING -- China"s smartphone market saw steady growth in January with the sales increasing by 0.4 percent year-on-year to reach 30.87 million units, according to an industry report. On a month-on-month basis, smartphone sales volume rose by 38.6 percent from December 2021, according to a report by the research and consulting company CINNO Research. Domestic smartphone maker Oppo took the top spot with its sales up 42.6 percent from a month ago, while Vivo followed with an increase of 55.8 percent, the report said. Honor maintained growth momentum last month as its sales went up 242.9 percent from a year