Summary: iTunes, creating the Ringtones area in your library right away if this is the first time you work with M4R files in iTunes. If not, the new ringtone will simply be added to your collection. To transfer the ringtone to the iPhone, simply go to the Ringtones tab inside the iPhone area in iTunes and sync your iPhone. Your brand new personalized ringtones will be available in
Image Dimensions: 400 x 256
Image originally found here.