Question: how to set ringtone in iphone 4s from music library?
Answer: Click on the iPhone icon and go to Tones -> Sync Tones -> Selected Tones -> and select your tone and sync your device. Back on your phone, head to Settings -> Sounds -> Ringtones and select your new ringtone from the list (it should be right at the top). Follow the simple steps & enjoy your ringtone.