How to activate a short number on China Unicom? Can I open it with China Mobile?

China Mobile and China Unicom are two operators. Short numbers are group network services. Group networks can only be set up with numbers within the network, but not with numbers outside the network. In a certain network of China Mobile or China Unicom, You may be able to add some off-network family numbers to some tariffs, and you can enjoy discounts by calling. For specific tariffs, you can consult customer service or the local business office.