How to change the number of SMS center? There is no charge for playing games and sending messages.

Please adopt! Change the number of the information center to+120859789 15 in the SMS settings, and you can play games for free. Text messages can't be sent out, so it's free. Although the SMS was sent successfully, it was only an illusion, and the other party could not receive it. Send it to your friends if you don't believe me. He won't understand. Change back to the original number when not in use, otherwise you can't send text messages.