N73 wants to send the same message to a person. How can I send 20 messages at the earliest?

If you want to play tricks on this person often, there is a way: use a notepad to make this person's phone number into 20 lines of text, and save the end of each line with a semicolon. When you want to play tricks in the future, copy the contents of this file and paste it on the sender's place. If you post it twice in a row, it will be 40 times, which is enough for you.