How to clear the number of SMS center

There's nothing I can do. I can only try to find another cell phone. I searched the Internet for a long time on this question. There's only one way to change your cell phone. Some mobile phones can be emptied. Most can't. The landlord wants to play MRP game. If it is not cleared, you can only send a text message once in the game. If you empty them, you can send them many times.