voicemail issues

[vkarlski]

Hi everyone I have an issue with my nexus s 4g. I flashed cm7 5 days ago and I set up my voicemail on it with sprint. My friend left me a voicemail when I dialed in it says the key you entered is not correct then it hangs up. I don't know where this came from. Any help/ideas?!

 

[vkarlski]

Also I didn't type anything in it just says the key you entered is not correct.