How to change the number of the short message center of telecom mobile phone so that the short message cannot be sent out?

First, find the location of your SMS. After entering, there are usually two short messages, and MMS opens the message. Then there is a service center number {+86 * * * * * * *} You remember the number, and then delete a number. Can't send it out. If you want to accept and send, just enter that number!