Rules for messages
This topic describes the rules for sending messages from Short Message Service (SMS). These rules include message length and delivery frequency.
Length rules
The maximum length of a message is 500 characters. Each English letter, digit, symbol, or Chinese character is calculated as one character.
English
Each letter, digit, or symbol is calculated as one character.
If a message contains no more than 160 characters, it will be charged for one message. If a message contains more than 160 characters, it will split into multiple messages that have a maximum length of 154 characters. A signature is enclosed in brackets ([ ]).
Other languages
Each English letter, digit, symbol, or Chinese character is calculated as one character.
If a message contains no more than 70 characters, it will be charged for one message. If a message contains more than 70 characters, it will split into multiple messages that have a maximum length of 67 characters.
Delivery frequency
If you need to limit the number of messages sent, you can configure the delivery frequency of messages sent daily or monthly.