alexchea

yes, but many steps need to do.
you may download FormatFactory, use this software to convert your mp3 to Apple RingTone, after finished, drag this ringtone file to your iTunes then u will able to sync to your iPhone.

or go find ringtone apps from Apple apps store, this software can help you to create ringtone, once you successfully created the ringtone, you need to connect your phone to itune, then drag the created ringtone from the document sharing to iTunes then sync to your iPhone.