I had the same problem. They would fix it and then it would stop working later. Did this 4 times. I finally figured out that on the iphone voice mail function it only works if you have carrier data enabled. If you have it turned off, then the visual voice mail will not work. Basically, you can only check visual voice mail if your carrier data is enabled. I have mine disabled. I am on the by the gig plan. So, if I want to check visual voice mail, I have to enable carrier data, check my voice mails, then turn off the carrier data. It is really an apple problem.
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Set up voice mail initially. Kept saying that Visual voicemail was not available. I could get voice mail by selecting the "Call Voicemail" option. I took phone in to an xfinity office. They got tech support on line and was able to get the visual voice mail working. I rarely get voice mail. About a week later, I tried to check voice mail, and I again got the visual voice mail not available. I called tech support and they got it working again. Ok. About a week later, the visual voice mail is again not working. I call tech support, and they cannot get it working this time. Ticket # 15133639. They recommend I call apple support. This is clearly not an apple issue. It is a software issue on the xfinity side of the house. How about some meaningfull help. An acceptable answer at this point is "Hey, we got a technical issue we cannot at this time. We are working on it. We will get back to you". Providing you actually get back to me.
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