How do you get rid of the voicemail notification on an Android?

Quite a few times, I have listened to a voicemail (that's the notification shown in the far left of the bar above), pressed 7 to delete it, and exited, only to discover the voicemail notification was still peering up at me from my notifications bar. I find this insignificant problem maddening. And it took me quite a few tries of redialing my voicemail inbox, knowing I didn't actually have an unheard voicemail, but attempting again to remove that icon, before I discovered the solution.

One time, early in my smartphone experience, the ridiculous malfunction my brilliant Android displayed had me irate. I held my number 1 key and mashed in my password, with the intention of letting the message play the whole way through, to see if that would fix it. I was engaging in un-American sentiment, holding my phone guilty until proven innocent; I did in fact have an unheard message. That is why I caution you to verify your phone's guilt before attempting my solution.

Now the solution: if your phone displays a new voicemail notification, but you are confident you do not have a new voicemail, simply call your Android from another phone, and leave a voicemail. Now when you dial into your inbox from your Android, your phone should return to normal function, which would be to remove the (now accurate) notification that you have a new voicemail, once you have listened and deleted it.