1069 platform how to send short messages in groups with forms?

The format of 1069 group SMS is signature+content+unsubscribe back to T. It should be noted that "signature" and "unsubscribe back to T" must be added here. The SMS signature is generally located at the beginning of the content, and the unsubscribe back T is generally located at the end of the content. The specific location can be determined according to your actual situation. In addition, it should be noted that there is a word limit for SMS group sending. The number of words in a single message is 70, and 1 Chinese character, 1 letter, 1 number and 1 symbol are all one character. Those with more than 70 words are long messages, which are charged according to multiple messages. At present, the short message sending platform on the market supports 50.