Iphone5 American mobile phone has a signal, but even the information can't be sent out. What happened?

Maybe you should add the 86-day version to the text message. That's it. Just try it.

Thank you, but you are wrong. You can't add 86 to texting. I used to add 86, so I couldn't send text messages. Just dialed a pure mobile phone number, and the text message was sent out. Thank you very much for reminding me of this 86 question!