The method is as follows:

1. Open itunes and connect your phone to the computer.

2. Download music, the music format must be *.m4r format.

3. File-> Add files to the database.

4. Right-click the name of the music file just added to display the introduction.

5. Option: Set the start and end time of the ringtone. The length cannot exceed 40 seconds. Confirm.

6. Left-click to select the ringtone file -> click the file button of itunes -> Convert -> Convert to acc file.

7. Right-click the previously generated m4a file -> Display in Windows Explorer -> Rename the modified format suffix .m4a to .m4r

8. Change the .m4r file Drag it to iPhone in iTunes -> Automatically sync. :

iTunes is a free digital media playback application for Mac and PC that can manage and play digital music and videos. Launched by Apple Computer at the Macworld Expo in San Francisco on January 10, 2001.

The iTunes program manages content on Apple's iPod digital media player. In addition, iTunes can connect to the iTunes Store (assuming a network connection exists) to download purchased digital music, music videos, TV shows, iPod games, various podcasts, and standard feature films.