Warning: Apple software quality has slipped over the years. You may need to manually retry a step dozens of times in order for the step to take effect.
- Obtain an original iTunes-compatible ringtone audio file, such as MP3, WAV, AAC/M4A/M4R.
- Import this original file into your iTunes library.
- Use the iTunes File menu to ensure the file is converted to AAC format.
- Navigate to the song using iTunes search.
- Use the alternate menu to navigate to the AAC-formatted song's location in Finder.
- Rename that file to use a
M4R
extension. - Connect iPhone to Mac via wired connection.
- In iTunes, nagivate to the iPhone device.
- Navigate to the Tones section.
- From Finder, drag and drop the M4R file onto the Tones list.
- On the iPhone, navigate to Settings -> Sound -> Ringtone.
- Select the desired ringtone.