There is no call, why is there a text message to remind you of the call?

Hello! I hope the following answers can help you.

Mobile phone system error or other reasons may cause the caller to dial your mobile phone, prompting that it cannot be connected. In this case, there is no prompt on your mobile phone, and the call reminder will remind you of this call by SMS.

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Please keep asking questions. I wish you a happy life, thank you!