I have a Samsung A737 phone. I bought a micro SD card to put mp3s and what not so I can make them ringtones. Well when I did the option of Set As>>Ringtone did not appear it works with pictures. So I cut it down into a 30 second clip still doesnt not show that option I even copy the file into the phone still doesnt show the option. How can I make my 30 second mp3 into a ringtone? I know the pre-set ringtone file format was .mmf maybe it has something to do with that?