Do I need a card to send text messages?

If the mobile phone can't send short messages, I suggest you check it in the following ways:

1. I suggest you change your mobile phone to see if you can send and receive short messages.

If you can send and receive short messages, I suggest you re-insert the card into your mobile phone and send yourself a short message to see if you can receive it.

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

4. Check whether the number of SMS center is set correctly.

If you still can't solve your problem, I suggest you take your mobile phone card to the local business hall for testing.