I just bought an Apple tablet and a Unicom card. Why can't you send text messages? Just check the phone bill. . .

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, SMS center number is set incorrectly;

2. There is no signal or the battery of the mobile phone 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 a short message 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 has not been solved, it is recommended to contact the local manual customer service for handling.