Unicom 3g card can't send and receive short messages.

If the SMS function of this number is turned on normally, you can't send and receive SMS after changing the card. You can take the card to the business hall for testing. If you can't send a text message, but you can receive a text message, it may be caused by the wrong number of the SMS center on the mobile phone card after the card is replenished. You can reset the SMS center number on your mobile phone. The SMS center number of Sichuan Unicom number is+8613010811500.

How to set up an ordinary mobile phone: enter the "SMS" menu of the mobile phone, enter the SMS center number in the "SMS center number" column, and press the OK key, and the code will be stored on the SIM card.

The method of setting SMS center number on iPhone is as follows:

1. Inquiry method: dial * # 5005 * 7672 # with iPhone;

2. Setting method: use iPhone to dial * 5005 * 7672 *+86 "SIM card home SMS center number" #;

3. Delete method: dial ##5005*7672# with iPhone.

Tips: The set SMS center number is generally similar to the mobile phone number after +86. When setting the number of the SMS center, please insert and unplug the SIM card again. It is suggested to delete the SMS center number first and then set it again.