What if iphone5s can't send SMS? How to solve

1. Look at the upper left corner of the iPhone display to make sure that you are in a strong signal area, and make sure that the flight mode is turned off. If the signal is weak, please try to move to another location. If you are indoors, try going outside or moving to a window.

2. Please consult the wireless carrier to check whether your SIM card is in normal condition.

3. Be sure to tap in the text input field at the bottom of the screen first to bring up the keyboard. Before you start typing, the "Send" button is always displayed in gray, and after you enter the text, the "Send" button is displayed in bright color and is clickable.

4. If you can't click Send after entering the text, the "Send" key is still gray. Please set the > SMS > Turn off Show Subject Bar.

5. If you are trying to send a short message to multiple recipients, and you enter each number manually instead of using the address book list, please make sure that you separate each number by pressing a line break instead of a space.

6. If you still can only receive messages, you can't send them.

after the above problems are eliminated, you can use the internal command to query and edit the SMS center number:

Set the SMS center number: dial *55*7672*+86 SMS center number # with iPhone;

to delete the SMS center number, dial ##55*7672# with the iPhone.

to inquire about the set SMS center number, dial *#55*7672# with iPhone.