How to send a message by short number on a mobile phone?

Handle short numbers according to the area divided by the mobile phone. For example, the last time I moved outside our school, I recommended that we join the campus cornet, but this time it was free. There were so many people in the school that he made us a regional trumpet. Calling cornet is 6 cents per minute. Our cornet begins with 6, so students who join the cornet add a 6 before the last four digits of the called number. For example, the last four digits of Xiao Wang's mobile phone number are 5523, so adding a 6 before 5523 is 65523 for a long time, and then making a phone call, which is the short number. There is another charge. You can add your own cornet members. It seems that joining cornet costs two yuan a month, and I forget how many minutes you sent for free calls. It seems to be 2000 minutes, and the charges vary from place to place. You can consult 10086 to earn labor service or authorization.