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China Mobile 139 E-mail-What's the use of writing short messages?

SMS is short for ShortMessagingService.

Is a technology that can send and receive text messages by using mobile devices. The maximum length of a short message is 160 bytes (about 80 Chinese characters, so short messages are usually limited to 70 Chinese characters because other related information has to be sent), which is equivalent to the space occupied by a voice call of about 1 second, so its communication cost is very low.