What is the unified customer service telephone number of China Unicom International Roaming?

China Unicom international roaming unified customer service telephone number 8618618610010. Only the mobile users of China Unicom can use it in the international roaming state, and the dialing method is the same as that of ordinary domestic mobile phone numbers. It is free to call this number through Unicom mobile phone as a caller outside China, but it is not free to call18618610010 with the contact method outside China Unicom.