Question: how to set custom mp3 ringtone in iphone?
Answer: Step One: Get iTunes. You almost never have to use iTunes with a modern iPhone, but adding your own custom ringtones still requires it. ...  Step Two: Choose a Sound File. ...  Step Three: Convert the MP3 to AAC. ...  Step Four: Rename Your AAC File. ...  Step Five: Add the Ringtone File to Your Phone. ...  Step Six: Choose the Ringtone.