Unicom can't receive SMS when it handles the card.

First of all, you can take out your mobile phone card and put it in someone else's mobile phone to see if you can send and receive short messages. If you can, you can prove that your mobile phone card is ok. For mobile phone problems, you can check the manual of the mobile phone terminal or contact the after-sales service of the mobile phone for detailed understanding.

Secondly, if you still can't send and receive short messages normally and the number of the short message center is set correctly, you can contact the local customer service or go to the independent business hall of China Unicom to confirm whether the short message function of the number card is opened normally.