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Xiaomi 2 Telecom's mobile phone can't send and receive short messages. What does the error code-1 mean?

I have the same problem. I enter the dialing interface, enter * # * # 4636 # * * to enter the mobile phone settings, and then click IMS to send SMS. This problem occurred after replacing the 4G card.

There is another way, after the boot, switch the flight mode once, and then send it normally, but sometimes there will be problems in receiving SMS.