Why can't 5s send messages?

1

Problem status: I just bought it. I can answer the phone and receive text messages, but I can't send them. It shows that it has not been delivered yet. Restoring network settings doesn't work.

2

Network reset, trying to close imessage.

three

Enter "50057672*+86" under the dial pad, then add the center number and address of your location (if you don't know, you can call customer service), add "#", pause for a few seconds, press the "Call" button, the words "successful, the address is empty" will be displayed, and then restart your iphone5s, and you can send text messages after booting.