Apple 4S can only receive short messages, not send them. How to solve it?

In the settings, SMS and imessage are sent by SMS when they are not available. Just turn on this option.

Mobile phones can only receive short messages, not send short messages. Generally speaking, the number of the short message center is wrong. The suggested solutions are as follows:

Check whether the phone bill is sufficient.

The attempt to move the position may be related to the signal of the position.

Check whether the number of the information center is entered correctly: Information-Menu-Settings-SMS Settings-Information Center-Set the number of the information center (please consult customer service 10086 for the number of the information center). Please have a look at whether to set up a blacklist. Settings-Click Call/Message Blocking-Click Message Blocking to select the number and phrase to block registration-Click Message Blocking List to delete the number inside.

Whether to set the upper limit of SMS reception, it is recommended to turn it off.

Whether or not to install third-party communication software may receive a short message, so it is recommended to uninstall it.

Try another SIM card, turn it off and restart observation.

Back up important data and restore factory settings.