China Mobile Ltd said it signed up a total of 4.44 million new subscribers in June, bringing its total number of users to 273.79 million, Reuters reported. Among the new subscribers, 29100 were contract users and 4.15 million were prepaid subscribers, according to figures released on the company's website.   In the six months to June, the company added 24.28 million prepaid users and 1.5 million contract subscribers.