Yea but that doesn't fix the problem because if you listen to music in upsm mode when the screen turns out, your music will also stop. ? So does someone has an solution for this?
Here is what i did to customize my ringtone for text messages:
Your phone has to be rooted so you can use root explorer.
Then go to system-media-audio-notifications and in this folder you will copy your mp3 file into.
reboot your phone and then go to settings and you will find your ringtone in...