4Videosoft iPhone 4 Ringtone Maker is available for users to convert MP3 to iPhone 4, iPhone OS 3.0/3.1 Ringtone, even convert any video/audio to iPhone 4 M4R Ringtone, including 3GP, AVI, MKV, RM, MOV, XviD, M4A , MP3 to M4R iPhone 4 ringtone. Also convert MTV albums, concert recordings, and all popular DVDs to iPhone ringtone. Most pleasantly, you can put the converted M4R Ringtone on the iPhone 4.