I was purchased a 0138888xxx beautiful straight "8888" number and getting to insert the sim card into my new iPhone. However this number was a pre-owned Digi number. Meaning that the previous owner has left all the voicemail unlistened. Since the number been inactive since 2022, when I insert into my new phone just straight showing a red dot badge on the Phone icon.
I don't want to turn-off the notification badge in the settings since I can't see income calling notifications in case if someone calling to this number.
I was tried to call the voicemail 121 to retrieve the voicemail but the system keep saying invalid mobile number. So is there any other method to remove all that voicemails?

Do you confirm change to esim will works? I also planning to switch my plan to hotlink postpaid but the Maxis customer service told me that I have contract and need to terminate it first by paying penalty. I think try to change to esim first if it works.

I went to Digi Center to change to esim, finally the red dot badge been removed. Thanks for your solution.