What kinds of short messages are there? How is it classified?

Short messages are divided into point-to-point short messages, SP short messages and CP short messages. Peer-to-peer SMS refers to the business of exchanging limited text or binary short messages between mobile users of China Telecom and users of fixed network, PHS network and other operators' networks. According to the roaming status and sending direction of users, it can be divided into China Telecom's intra/inter-network short messages, international short messages and international roaming short messages. 1. China Telecom's intra/inter-network short messages refer to point-to-point short messages sent and received between China Telecom's mobile users and China Telecom's mobile users, and between China Telecom's PHS/PSTN users and users of other operators in Chinese mainland (including users operating PHS/PSTN). 2. International SMS: refers to sending and receiving point-to-point SMS between mobile users of China Telecom and operators outside Chinese mainland. 3. Roaming out of international short messages: refers to China Telecom mobile users roaming to the mobile network of operators outside Chinese mainland to send and receive point-to-point short messages. 4. Roaming into international short messages: refers to the mobile users of operators outside Chinese mainland roaming into the mobile network of China Telecom to send and receive point-to-point short messages. For more service benefits, click on "official website" customer service 222 below to answer your questions.