Make sure you have iTunes on your computer first, as well as an MP3 or WAV of the song you need to convert. Import the audio or music file into iTunes on your PC/Mac, and convert the file to AAC. Rename the file extension to .m4r, followed by syncing the file to your iPhone. If you have GarageBand, there's a feature to save audio as a ringtone.
Chris has an issue where his phone is "robo dialing" without him. It's just calling numbers from his address book. He thinks it may have something to do with his Bluetooth headset, and Leo says it could be. It sounds like it is dialing the last number Chris called.