This is a top 10 global list of mobile phone network operators. For a more comprehensive list of UMTS and GSM operators :
China Mobile : Formerly owned by China, now still controlled by the state, one of the two mobile phone monopolies throughout China. China Mobile Limited provides wireless voice and multimedia services through its national mobile telecommunications network, the largest of its kind in the world. While a state-owned company, listed on both the NYSE and stock exchanges in Hong Kong. In addition to the largest network of world's mobile phone, China Mobile also has the largest number of mobile subscribers.