can't change my ringtone

[leeds_fan]

Help. I have tried to change my ringtone but it won't let me ,I go into ringtone +sounds,press ringtone,pick Nokia tune,it turn's blue and then I can see it in the ringtone box.ringer is on,vibrate is on,but when I ring my phone the tune it plays is not the one I picked,I think it is the one that came with the phone,any suggestion's please. Thank's