Is filesharing ringtones legal?

[Inca Orchid]

I have started uploading clips of sound files or ringtones to a media share site where web users can download mp3 versions for ringtones to their phones.
2 questions for the knowledgeable:

1. This is so easy to do- is it legal?
2. What format do most/all cellphones use for ringtones? e.g. mp3

 

[lornaevo]

This is not a legal practice.

 

[gabbott]

This is not a legal practice.

To be more specific, it is not legal practice to do so with copyrighted music/sounds.

 

[zak]

so does this mean that the app that i downloaded that i get mp3's for free from is illegal? As far as I know I'm not uploading anything to it.