How to make SMS ringtones with ITunes?

Use ITunes to make SMS ringtones and import them into iPhone as follows:

1. Connect the iPhone to your computer and add the music files you want to make into ringtones to itunes.

2. Open the "Recently Added" option in itunes, right-click the added music file and click "Show Introduction".

3. Set the length of the ringtone in the options (no more than 40 seconds).

4. Right-click to set the music file and select the "Create AAC Version" option.

5. After successful creation, change the file format to M4R (the original file format is M4A).

6. Click the ringtone option in itunes, and then click Apply to sync ringtones to the iPhone.