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How does China Mobile set the call balance reminder?

Call reminder service can send short messages through port number 10086 to inform customers of the call charges of the current month regularly, so that customers can know the call charges in time. It is divided into the following three types: 1, 1 time 7: 00-12: 00 every day (3 yuan/month is charged by the day); 2. 1 Once every two days in the morning.