5 silent/scam calls in 1 day

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The only problems with callsafe is that all callers who haven't been accepted as OK cannot leave messages on my answerphone as doctors withhold numbers this means they can never leave messages.  I haven't activated it again since waiting for a hospital call 6 months ago and have only had 3 or so scam calls since.  If we could re-activated with the option of restoring previously held numbers or back up our numbers say in a spreadsheet and import via our accounts it would be awesome.