OK for you guys having problems doing the DRM way or have ATT do this and it WILL work..
Download AVR converter at
www.miksoft.net/products/MobAmrCon14-setup.zip
open and install but dont start yet. DL the update @
www.miksoft.net/products/amrUp15.exe update install
Now open up the AVR converter.
Select WAVE/MP3 to AMR
then in first box click browse and find the mp3 you want
in second box click browse and select name and where to save it
then click drop down menu under select MR>select 12.2
then click convert now.
now find the .amr file you made and upload it to your phone via phone mode and my phone explorer
once phone receives avr it will pop up saying use now and you will have option to use as ring tone
its not cd quality but does do the job and will be full length
This was used to make a mp3 as a rington on a se w580i on att service