Why can't I send short messages on my Unicom card 156? There is still 50 phone bills ~ the number of the information center has not changed.

The reasons why mobile phones can't send short messages are as follows:

1. SMS service is not enabled on the mobile phone. You can contact the local manual customer service or activate this function in the local business hall.

2. If the SMS center number is not set or set incorrectly, just reset it;

3. The signal is weak, there is no signal or the battery of the mobile phone is insufficient, resulting in the information not being sent normally;

4. After sending a large number of short messages, the short message function is temporarily blocked, and the short message function will be automatically restored after a period of time.

5. The sending format is incorrect. If you send a short message to PHS users, you need to add the area code before the number;

6. SMS sending and retention is valid for 24 hours;

7. Whether the SMS inbox and sending box are full;

8. It is recommended to restart the machine or change the phone to test it.

In addition to the above simple troubleshooting, it still cannot be solved. You can contact the local manual customer service for processing.