How to turn it into a message when someone calls after the phone is turned off?

Our company provides call reminder service. After handling the business, when your mobile phone is turned off, there is no power or signal, the incoming call will be transferred to the incoming call reminding voice platform, and a short message will be sent to remind you of the missed call. Due to the different policies of different cities, the name and charge of the call reminder service are also different. For example, some are called "call manager" and "boot reminder", while others are called "call treasure". For business details, please contact local manual customer service.

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