Unicom's short message didn't suggest how to do broadband.

If you can't send and receive short messages, you can try to restart your mobile phone or change it to test whether there are any of the following situations:

1, whether the cell phone signal is normal;

2. Whether the SMS function is enabled on the mobile phone card.

If the above situation has not been solved, it is recommended to contact the customer service of the place of origin for handling.