Who knows a lot about Android Smartphones?

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I am hoping someone here may be able to help me with this issue I am having with my android smartphone. I bought my phone from a neighbor and reset it to factory settings. I do not have service on it, I am just using it on wifi, but my neighbor did have service on it when he had it. He got a new phone and had his number transferred to his new phone. The issue I am having is, everytime he gets a voicemail, I get the notification on my phone and the icon will not go away until I go into my app settings and clear all data on the phone application. Why am I getting notifications of his voicemails even though I reset the phone to factory settings, and how do I make it stop? Since I don't plan on getting service turned on for this phone, I wouldn't mind completely disabling the voicemail all together, but I see no way to do that when I go to the application. I have tried googling it and seen that others have had a similar issue but I could not find a resolution for the problem.