Samsung A8 installed Unicom card to send short messages. The other party is Unicom. The mobile phone can receive it, but it can't. What's going on here?

After sending SMS, Unicom number can receive SMS, indicating that your number SMS function is normal;

If the mobile phone number can't receive the SMS, it may be a delay in receiving the SMS. I suggest paying attention next time.

If you can't get a text message from your mobile phone number, there may be something wrong with your mobile phone. You can turn off your phone again and try again, or you can try again with another phone.

Asking whether the other party's mobile phone number can receive short messages from other numbers, and judging whether the short message function of this number is normal;

If you still can't turn off your phone and change it, and the text message hasn't been received, you need to contact China Mobile or China Unicom for feedback, and someone will help you.