Ringtones and alarms on the iPhone use the M4R audio format. If you already have an alarm tone in an M4A format, you can change the extension to make it compatible with your iPhone alarm. Apple ringtones and alarms are identified by the operating system because of the extension used. Changing the extension from M4A to M4R doesn’t change the quality of the ringtone or alarm. Additionally, when creating an alarm, you must make sure the audio file doesn’t exceed 30 seconds since only the first 30 seconds are available to your phone or alarm application. For longer alarms, select a song from your music library directly within the alarm settings on your iPhone. Warnings Writer Bio
