Why can't Unicom send 7-digit short messages?

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 customer service 100 10 or open this function in the local business hall, which can generally be ruled out.

2. No or wrong SMS center number is set, just reset it.

3. The signal is weak, there is no signal or the battery of the mobile phone is insufficient, which leads to the information not being sent normally.

4. Because the system is busy, especially during the peak period of texting on holidays, I suggest you try again in the future or avoid the peak period.

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 outbox are full.

8. I suggest you restart your mobile phone or change it for a test. You can change your mobile phone and see if you can send and receive text messages. If you can send and receive short messages, I suggest you plug the card back into your mobile phone and send yourself a short message to see if you can receive it. If not, I suggest you check whether it is a sim card problem. Bring your mobile phone card to the local business hall for testing or replacement.

9. There is no charge for mobile phones. This possibility still exists, and you need to confirm whether your package itself includes the call duration. If the call time is not used up, there is no SMS gift, and the phone bill is not enough, it may happen to you.

10. SMS function is abnormal. This needs to contact the hotline customer service and confirm through the background system.