I just got an iPhone5S and want to use an mp3 I have in My Music as a ring tone.
How can I do this. The manual only seems to talk about purchasing tones.
EDIT I have made a 40 second m4r file and it is in My Music on the iPhone, but I can't find it in Ringtones.
I cannot find "Sync Ringtones" in the phone sync options.






