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Do I need to open international roaming when sending short messages from China to Thailand?

Need. According to the inquiry of the mobile phone client 12308 of the Ministry of Foreign Affairs, sending short messages to Thailand in China requires international roaming service, and it is impossible to send and receive short messages abroad without international roaming. International roaming service is a service that allows you to use your mobile phone to answer and make calls, send and receive short messages and use data networks abroad.