Unicom card can't send and receive SMS in 4G state after enabling VOLTE.

If your mobile phone can't send short messages, you can try to restart or change your mobile phone for testing to see if the following conditions exist:

1. SMS center number is not set correctly. Please re-enter the correct SMS center number.

The short message center number of Tianjin Unicom number is+8613010130500.

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. It is suggested that you 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 short message sending time exceeds 24 hours;

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

7. Blacklisted by SMS;

8. Insufficient quantity balance;

9.SMS inbox and outbox are full.

If you still can't solve your SMS problem, you can contact our customer service staff and we will contact you within 48 hours.