How do i get rid of my Callback tone on my Nokia 3120c?

Ok I have Owl City as my callback tone and as you imagine it gets annoying! So I would quite like it if I could take it of so i just have the standard ringing tone. But I do not know how! So PLEASE tell me!
I was told only your carrier can do this? How do I go about that?
Thanks always
xx
 
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