I tried to put mp3 files in ringtones folder of my phone using my computer. It did appear from the list. Is there any requirement of mp3 file? Is it working on other types of files?
Can you advise why I need this app as I have ringtones of mp3 file using on other phone and I just transfer the file to Windows Phone only.
I have no idea if there is an app to do this on your phone, but there are several free ways to do it on the desktop. I use a program (free!!) called MP3Tag. From there, just open your ringtone file in MP3tag and there is a tag section for "genre". Just name it "ringtone". Save the file, and transfer it to the ringtone folder of your phone.