Mobile phone messages are often swallowed and need to be restarted to receive them. What happened?

In fact, that "=" ≦ only shows the gprs connection status. As for incoming calls and text messages, "≦" is displayed because you use a non-3g mobile phone card. At present, most mobile phone cards use gsm to make calls and gprs to surf the Internet, so they cannot be used at the same time. As for not displaying SMS, it may be that the mobile phone software failed to return to the factory.