mp3 is a popular audio format abbreviated for MPEG-1 Audio Layer 3, which is a form of lossy data compression. The use of a lossy compression algorithm is designed to considerably reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners.
iPhone is a smartphone designed by Apple, although iphone has a lot of very cool features, it does not like some other smartphones to use mp3 files as ringtones. Now, you can use tool like 
Cucusoft iPhone Video Converter Suite to convert mp3 to m4r.
Cucusoft iPhone Video Converter Suite is the fastest Video & Audio to iPhone converter software. It can convert almost all kinds of multimedia formats to iPhone format in a minutes and have excellent video/audio quality.
Support convert mp3 to m4r, iphone only supports M4R files as ringtones.
Have powerful functions, but easy to use.
Support all kinds of multimedia format to iPhone format.
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