LG F240 can receive short messages, but can't send them. What should we do?

If you can't send a text message, you can try to restart your phone first, or check whether the balance of your phone is sufficient. MMS stands for MMS, indicating whether it has been sent by MMS. To set the number of the information center, you need to enter the SMS interface first, and then click the menu button-Set, you can see the information center, and then dial the consultation number of the local operator. The way to enter the engineering mode is not universal, so don't worry. If you still can't solve it, you can try to return to the factory.