You can create iPhone ringtones from sounds and effects using both Mac and Windows
based PCs in just a few simple steps.
Step 1: Create Ringtone
Download the MP3 from Soundboard.com that you want as a ringtone and add it to iTunes.
Once added, right click (control + click) or from the Advanced menu item on the
menu bar select the "Create AAC version" option.
Step 2: Rename and Add the Ringtone
Once the file has been created, again right click (control + click) and select the
"Show in Finder" option; on Windows you should click "Show in Windows
Explorer". Now rename the file and change the file extension from ".m4a"
to ".m4r". Remove the MP3 and AAC version from iTunes, and drag the newly
renamed file into iTunes. The ringtone should now show up under the Ringtones section
of the Library in the left hand sidebar.
Step 3: Transfer and Test the Ringtone
Now that you have your ringtone, go to the Ringtones section of the Library in the
left hand sidebar and drag the newly created ringtone to the iPhone you want to
use it on, just as you would an MP3. You should now see your ringtone on your iPhone,
under the Settings / Sounds / Ringtone menu. Select your Ringtone to preview it,
and you are all done!