I am a Unicom card, and the SMS sent by mobile users can't be received, but Unicom can, and it is normal to make a phone call.

Well, I'll say one possible reason ..

First of all, it's definitely not the mobile phone.

One situation is that the mobile phone is restricted and the short message is not allowed to be transmitted to Unicom. This is possible. In the past, our school's telecom mobile phone was connected to Unicom, and it was good to call telecom, but it couldn't move. Later, it was found out and reported on the Internet.

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The solution is to switch to a mobile card, because China Unicom's market share is much smaller than that of China Mobile, so they certainly dare not restrict texting with China Mobile, otherwise they will lose a lot of market share.

civilians like us are unable to compete with this monopoly enterprise, so we can only comply with the meaning of mobile and use mobile cards.

When I didn't know there was such a situation before, I often said that China Unicom was too bad ... Now I really feel a little sympathy. ..