Apple 6s can't receive or send short messages. What happened?

It is possible that the flight mode has been turned on.

There is an error in the Sim card.

Method:

1, confirm that the signal is normal and close the flight mode.

2. Check whether the SIM card status is normal.

3. Check whether the send key is displayed in bright color and clickable.

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

5. If you send text messages to multiple people and manually enter numbers, please make sure to use line breaks instead of spaces to separate each number.