I know you said your sure its an MP3 file. From my understanding Itunes converts mp3s to a different file. Double check this. If you have a file explorer you can check the extension of the file. If you don't have one i suggest Astro File manager.

 

Could be apple putting their copyright laws embedded into the file. They are really anal about copy and pasting there songs to different places.

 

from what I understood from a friend doubletwist supposedly helps with this.

ec7433 have you tried playing the files on another phone or on your computer?

what did you use to convert the files?

 

Guys i have the exact same problem i been sooo frustrated... i downloaded a few songs that i liked in MP3 format yet when i try to play them on the phone it says unable to play this audio file... and it says .MP3 MPEG 3 layer Audio Blah blah blah the whole nine. but it just keep saying the same i tryed downloading the same music from diferent places and still same problem. plz help