What does the message length in the short message bill in the mobile company mean?

hello, it's my pleasure to serve you! Mobile SMS is defined as a 7-word message! The message length in the short message bill refers to the number of words in the short message. When the length of a short message exceeds 7 words, it will be counted as two, and if it exceeds 2 words, it will become a multimedia message! I hope I can help you! Mobile phone typing is really tiring, hehe.