How does Apple iphone modify micro-tone? Tips for micro-signaling sound setting

The method is as follows:

First convert the MP3 sound file that is intended as a micro-tone to the M4R format, and then rename the sound file to IN.CAF.

IPhone5S the method of replacing the micro-tone signal

Then install the Sync Assistant or itools to locate in the File Manager
To/var/mobile/applications/f92128be-8e61-4695-8168-2f1188116b76/micromessenger.app/, Then replace the IN.CAF in the directory with the prepared IN.CAF file. Finally reboot the IPhone5S cell phone, the micro-tone note has been replaced by you think

Apple 5s (only way to use Apple 5s)

1, into the Cydia download installation plug-in ifile;

2, the use of Ifile,wifi transmission, the need for the bell-CAF format renamed IN.CAF, and then through the WiFi to IFile, the first will be user\applications\ Micromessenger.app in the IN.CAF Delete, and then cut and paste into the micro-letter app directory, and finally remember to log off once on it.