How can I change my voicemail receiving message on my samsung phone?

I just got a new phone but i got my moms old number and it still has her voicemail on it.How can I change it to my voice?How can I change my voicemail receiving message on my samsung phone?it depends on the carrier if it is through cingular/att then you can call us and have us reset the voicemail if its through another carrier they probably can do the same.