Why is the data connection of Xiaomi 4 mobile phone Unicom version open, or is there a short message that can't be sent out?

If your mobile phone can't surf the Internet or send short messages normally, I suggest you check whether your mobile phone card still has phone charges. Generally, you can't surf the Internet or send short messages when you are in arrears or in a semi-stop state.

If it is not overdue downtime or semi-downtime, I suggest you also check the situation that you can't get online:

1. Confirm whether there is a network, and suggest you use it where the signal is strong;

2. Confirm whether the parameters of the mobile phone have been set, or check whether there is any problem with the network mode setting of the mobile phone;

4. Check whether the mobile phone card is plugged in. If it is plugged in, but it still doesn't work, I suggest you go to the business hall of the relevant operator to check whether the mobile phone card is faulty or not.

5. Check whether there is anything wrong with the mobile phone. I suggest you change your mobile phone for the test.

The above situation has not been solved, you can contact the relevant operators for manual customer service.

Mobile phone can't send text messages. In addition to overdue downtime or semi-downtime, it is recommended that you check the following:

1. I suggest you change your mobile phone and see if you can send and receive short messages.

2. 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.

3. If not, I suggest you check whether it is a sim card.

4. Check whether the number of SMS center is set correctly.

5. Bring the mobile phone card to the business hall of the relevant operator for testing or replacing the mobile phone card.