My mobile phone card is Unicom. I can only receive information. I can't send messages. What is the reason?

If you can't send and receive SMS, you can try to restart your phone or change it to test it, and check whether the following conditions exist:

1, SMS center number is set incorrectly;

2. There is no signal or the mobile phone battery is insufficient;

3. The system is busy during the peak period of holiday SMS sending, so it is suggested to try again later or avoid the peak period of sending;

4. The sending format is incorrect. If you send SMS to PHS users, you need to add the area code before the number;

5. The mobile phone shields the short message sending function;

6. Blacklisted by SMS;

7. Insufficient quantity balance;

8. SMS inbox and outbox are full.

If the above situation is still unresolved, it is recommended to contact the local manual customer service for handling.