iPhone5s A1518 cannot send text messages using China Unicom card

You can try to restart or change the mobile phone for testing, and check whether the following conditions exist:

1. The SMS center number is set incorrectly;

2. None The signal or mobile phone battery is insufficient;

3. The system is busy due to the peak SMS sending volume during holidays. It is recommended that you try again later or avoid the peak sending period;

4. Sending format Incorrect. If sending a text message to a PHS user, the area code must be added before the number;

5. The text message sending time exceeds 24 hours;

6. The mobile phone has blocked the text message sending function;

7. Being included in the SMS blacklist;

8. The number balance is insufficient;

9. The SMS inbox and sending box are full.

10. To inquire whether the SMS function is activated, you can contact the local manual customer service.

If the above reasons still cannot be solved, you can contact the local manual customer service or go to the business hall to confirm whether the SMS function is activated, and Leave it to the staff.