voicemail sms from sprint prior to loading new voicemails????

[yachtspecco]

My 3d for a while now has been doing something wierd. If I don't pick up a call it goes to voicemail. After the caller leaves their message I receive an SMS titled 9016 which when opened says //ANDROID:{callers number}has sent you a Sprint Voice Message. Call 408-970-0000 to listen MMSN followed by about 25 upper and lower case charactors and numbers.
I then receive my usual alert and voicemail notification icon appears. Were it not for unlimited texts on my plan I would be pissed off. It is primarily an annoyance now. How do I stop it???? I am using Handsent sms/mms program from the market but it comes in on the stock htc sms program as well. Tried changing notification settings but can't stop this from happening.
John