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How to get rid of the sound after the successful sending of iphone4s SMS?

I just made this.

Connect the computer to the 9 1 mobile assistant, click the function encyclopedia on the upper right of 9 1 mobile assistant, and then there is a file system on the upper left. Click in, find the system, double-click in, double-click in the library, find the audio, double-click in, and then double-click UIsounds. There will be many ringtone files in it. Just find the sending message and delete it.