I've had a missed call icon on my phone for the past week. I don't have any missed calls, and i've checked the call log to try and figure out how to get rid of it. I've also pulled the batterie multiple times to try and get rid of it.
I would say delete any missed calls from your call log. This happened to me and when my phone ran low on mem mort, it auto deleted me call log and I never had the problem again. Good luck
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I have heard of this problem before and the solution I have also heard is to call yourself and leave a voicemail. Check the VM and the icon should go away.