(Android programming enables the mobile phone to automatically send SMS when required. Note that this function should be used with caution to protect user privacy. When the program is implemented, specify the mobile phone number, specify the message content, and realize the function of sending SMS automatically through the reservation code. If the message is sent successfully, give a prompt, and the receiver's mobile phone will display a mobile message with the content of "This message is sent automatically". This document includes the following annexes:)
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