Iphone4 SMS can't send a problem, let's talk.

There is no conflict between chatting and texting on iPhone. If your mobile phone has not escaped from prison, it is even less likely that the so-called software is poisonous. If your SMS center number is correct, you can put your card on another mobile phone to see if you can receive and send SMS. If not, please call the operator to see if there is any problem with the operator. If you can, see if your mobile phone has escaped from prison. If you have escaped from prison, please check whether the relevant plug-ins are installed. Some plug-ins may filter short messages, resulting in the situation that short messages cannot be sent and received. If it is a jailbreak, please check the settings carefully. Under normal circumstances, you don't need to manually set the SMS center number. You can try to restore the settings of your mobile phone and see if you can send text messages.

I hope my answer can help you ~