China's online population, the world's largest, has reached 420 million as more people access the Internet with cell phones. The number of Internet users grew by 36 million in the first six months this year, the China Internet Network Information Center said in a report on Thursday. China's population is more than 1.3 billion. Spurring the growth was mobile Web use, stemming from popular services that support video and other Web products. About 277 million people get online with their phones, AP quoted the report as saying.