Telecom can't receive Unicom information, sometimes?

Short messages are distributed within the network (telecom to telecom, Unicom to Unicom, mobile to mobile) and between networks. Due to the addition of the short message gateway between networks and the paired deployment of both parties, the problems of either party or cooperation will cause the delay or even loss of short messages. Unicom SMS Gateway will submit the telecom SMS to your SMS center after receiving it, and complete the SMS distribution. If there is a problem between Unicom's SMS gateway and SMS center, SMS will also be lost. Judging from the information you provided, she can send it to others or receive it. Is it within the network? Is it China Mobile? This information helps to determine where the problem lies, but more than 70% of the probability is China Unicom's problem.