Voicemail wav file codec

[#1]

Is there one I can dload so that my voicemail will play on media player 11?
I need to access them working away on my laptop through a T-mobile usb  dongle.

[#2]

Hi there,
What voicemail are you referring to? Broadband Phone voicemail?

[#3]

Sorry yes broadband phone  I'm aware that I can phone the number and get the mail but I usually check my mail at night after work and I could do without the phone ringing at home.
Another point I should mention is that because of the tmobile package I have on the laptop I can't use xlite because voip isn't allowed which I assume is blocking me checking my voicemail.
I can save the them to disc but mplayer 11 and a couple of other free wav player dloads refuse to play them due to the codec.