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How does ITOOLS set SMS ringtones for Apple 4?

IP4 can choose the self-made SMS ringtone without jailbreaking, and the mobile phone version above 5.0 can set the self-made ringtone below 5.0. The call time is less than 40 seconds, and the short message ringing time is less than 30 seconds. The format is M4R. If the incoming call is displayed within 40 seconds (I said homemade ringtone), if the SMS ringtone is within 30 seconds, it will not be displayed for more than 30 seconds.