The SMS center number is not set correctly. For the telephone number of this center, please consult the network operator (1860 or 100 10).
Mobile phone arrears, the solution is to pay.
The short message storage in the mobile phone is full, so it is impossible to store short messages or even information reports. The solution is to delete the text messages that have been read.
In the mobile phone settings, there is one item: SMS settings network selection, automatic selection &; Only GPRS network &; Only applicable to GMS network, if you only choose GPRS network, you will not be able to send SMS. My classmate used to be such a reason. After my debugging, I can send text messages normally. Just try it.
Mobile phone can't send text messages. If the call is normal, it's not the card, but the information service center number in your mobile phone may have been deleted or changed, so you can't send text messages. The telephone number of the service center is +86 13800 (area code) 500 or you can ask the local mobile company yourself.