Voicemail quit working on AT&T iPhone 4?

This has been going on since December. My visual voicemail was working perfectly fine, no problems, nothing. Until one day around March my friend asked me why if I got her voicemail, I was like no.sorry. Then I looked in my voicemail and the last voicemail I got was in December. I thought that was really weird so then I called my cell phone off of my house phone and left a voicemail. Didn't get it. I even dialed 1 on the keypad and went to my voicemail and it said "You have zero messages" Okay that was weird, but I don't really listen to voicemails so I didn't mind. Around May I had to reset my phone for a different reason, but my voicemail didn't fix. In June I jail broke my phone so I don't think I can bring it to AT&T or anything… I'm now waiting for a phone call that I really need and if I miss it I'm afraid they will leave me a voicemail and I will never get it. Any ideas on how to fix this problem?

To check voicemail on my 4 i have to call my number because i switched from verizon to pageplus. So try calling your own number on your phone

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