Why can't I send text messages after paying the phone bill?

The mobile phone has a phone bill but can't send text messages. Suggestions can be handled in the following ways:

Check whether the number of SMS center is set correctly.

It is suggested to change your mobile phone and see if you can send and receive short messages.

If the mobile phone card can send and receive short messages on other mobile phones, I suggest you plug the card back into your mobile phone and send yourself a short message to see if you can receive it.

If not, I suggest you check whether it is a sim card problem.

Bring your mobile phone card to the local business hall for testing or replacement.