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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by crtasm on Wednesday January 30, 2019 @08:40AM (#19034905)
Great workaround.

"Please press 1" reminds me of the recent CCC talk on automating hacking mobile voicemail to get access to online account recovery codes.

Some websites required a key press before speaking the code so he simply recorded the DTMF tone on the voicemail greeting message.

https://media.ccc.de/v/35c3-9383-compromising_online_account...

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