Bought an iPhone and have no idea how to make personal ringtones? Wish to have your ringtone from previous phone? Or just don’t want to pay Apple for ringtone? No problem. Actually adding your ringtone to iPhone is really easy. It should be a file with .m4r extention which is actually .m4a file. So just convert your song from mp3 or another format to AAC, change extension to .m4r and you’re done! NOTE: A song duration must be not longer than 40 seconds to be imported as ringtone.