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What is the short message in the network?

Users in the same mobile communication operator send short messages to each other, which is called intra-network short messages, otherwise it is called inter-network short messages. Mobile to mobile, Unicom to Unicom, PHS to PHS are all short messages in the network, and vice versa. In addition, among them, SMS charges are only mobile subnets and networks, and Netcom and China Unicom are not divided.

Simple is the SMS sent by China Mobile, China Unicom and China Telecom's own sim cards! Well, that's interesting.