Written by iPhone 4S only supports M4R as the ringtone format. This audio format isn’t common. Apple introduced Ringtone creator, but this application is hard to use and has big limitation. You may want to convert your downloaded or collected video or audio file to m4r as iPhone 4S ringtones. Apparently, Apple’s ringtone creator can’t help you to make it.
In this case, i suggest you using Pavtube video converter. This tool is free for us to custom iPhone ringtones. Moreover, it supports importing a wide range of video and audio formats. Now, just check the following guide to learn how to convert movie or music clip to iPhone 4S ringtones.
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