Mobile phone cards send short messages, why do more words turn into MMS? What is the maximum number of words in a short message?

Short messages are within 70 words, including punctuation marks. Short messages are short messages in plain text and punctuation marks.

Short message, abbreviated as SMS, is a communication service that uses mobile phones to send and receive text messages with limited length, which can effectively save customers' phone bills. It is another effective communication mode besides voice communication. Send 70 Chinese characters or 160 English letters per SMS. If the limit is exceeded, it will be automatically intercepted and charged. If the model does not support it, it will not affect the sending and receiving of articles.