I haven't sent a short message to my mobile phone (Changhong). Why do I always prompt that sending failed? The number I sent is a number I used before, which has been stopped for a long time.

This will set the information settings in your phone. There is an information center number in it. You must call the service desk to ask for this number! Then follow the prompts, and then there will be no problem. If there is anything wrong, it is that there is something wrong with the signal line of the mobile phone. I have to go to the mobile phone repair station!

Please adopt! Thank you!