Record the sound onto the computer through a microphone. After the sound has been recorded, save it to the desktop. Open "iTunes" by clicking on the" iTunes" icon. Drag the sound file into "iTunes."
Right-click on the file that includes the sound. A menu will appear on the right side of the icon. Find the menu option that says "Get info," and click on it.
Click on the "Options" tab when the next window opens. After choosing the options button, an area on the window will appear in which the user can insert an amount of time that he wants the sound to play. In the box next to "Stop time," type in how long the sound should play. The sound can play for no longer than 30 seconds in order for the ringtone to work.
Select the "Preferences" menu, and click on the tab that says "Advanced." Find the word "Importing" from the "Import Using" drop-down menu, and click on it. Click also on "MP3 encoder." Select the "Custom" button from the settings box.
Make the sound a ringtone by right-clicking the sound's icon and choosing "Convert Selection to MP3." After clicking on this, iTunes will make another version of the file that is the same amount of time as was set in Step 3.
Open an email program and attach the file to an email and send the email to yourself. The file should be sent to an account that can be accessed on your cell phone.
Use the phone's Web function to open the email that was sent. Open the file. The sound now can be used as a ringtone on the phone.