Reliance CDMA — unable to set caller tune

I m unable to set caller tune on my mobile.I want to set the song which is khudaya khair from luck movie. please do favour,I realy love this song. please kindly suggest me for the same. I m trying so many times by my mobile through sms. I have a code of this song. I m sending the msg. like this way-CT 5927445 to 51234567.I think my process is right.My number is [protected].