How to set the song of Samsung s5660 mobile phone as SMS ringtone? Remember it's a text message, not a ringtone!

You find the Media folder in the memory card (if you don't have it, build it yourself), open the Audio folder (if you don't have it, build it yourself), and create three folders in it, namely, alarm clock, notification tone (SMS) and ringing tone. After putting the sounds you need into these three folders by category, select these folders in the ringtone settings.