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Blacklist settings such as SMS security software.

The user's own mobile phone number was blocked by the operator, and you complained to the operator that such notification messages were spam messages, which led to the blocking of messages by the operator. Solution, you need to contact the operator to solve this problem. Blacklist settings such as SMS security software. You used to set strict interception rules in SMS. Solution: Check the SMS blacklist settings, menu, harassment interception and settings, and check the interception mode and black-and-white bill respectively to see if there are any numbers that are not allowed to reach SMS.