How to get rid red dot over iPhone's phone icon?

So I have this red dot like over my phone icon and it's Really annoying! I know a lotta people have the same question on a bunch of others websites on google, but I've read a lot of them and was not able to find the answer. So again the question, how to get rid of the red dot? Please someone who have had this problem and actually got rid of it.

Its just a voicemail. Check your voicemailbox & clear it & it is gone. Simple.

I have and there's no voicemail message

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