I remember reading a bunch of complaints on sprint's boards when people went from a visual voicemail based phone to a non visual voicemail phone and something on the back end didn't get switched. They would get a text message instead of the vm indicator.
From what I remember, the visual voicemail app is supposed to grab the text and retrieve the vm from the link that's contained in the text. It's supposed to be an "invisible" text, but only when it's not. So if there isn't an app to grab it, then I guess they show up. I guess it's better than never knowing. But annoying nonetheless.
At least that's how sprint worked, I could be way off base here.
***edit to add, I always have to hit * at the end of listening to my voicemails to make the indicator go away before I hang up, again, not sure if it's sprint specific or not ***
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