Why is text messaging a dime ten years ago, and it's still a dime now?

The system stipulates. According to the charging system for short messages, the charge for a normal short message with less than 70 words is 1 cent. When normal SMS is sent, it will be charged according to one item. Short for SMS, it refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can receive and send short messages at a time is 160 English or numeric characters or 70 Chinese characters.