How do I get my Doro Liberto 820 Mini to receive all calls, accepts some but not others?

accepts some calls but noy oyhers

Hi Jim. What happens on those calls that aren't accepted? Are they instantly rejected or when you answer they get disconnected? I'm thinking that maybe you are using a call blocking app, I checked the manual and it looks like the phone doesn't have that feature built-in it. Did you install one recently? 

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