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Re:Ask HN: Would you be interested in a Spam-call Blocker fo... by smt88 on Friday March 27, 2015 @04:51PM (#9278915)
> blocks spam callers

True Caller does this[1], as does Google Voice.

> also has pre-screening

True Caller does their own version of this, where they'll tell you the name if it exists in their database.

> caller states their name before picking up phone

Google Voice does this exactly.

> working hours (i.e phone only rings at certain times, other wise goes to voicemail)

Google Voice does this, too[2]. There are also many apps that enable this. It may be a default feature of iOS and/or Android these days, for all I know.

1. https://www.truecaller.com/blog/avoid-spam-calls-with-trueca...

2. https://support.google.com/voice/answer/115145?hl=en

Re:Ask HN: Would you be interested in a Spam-call Blocker fo... by kidlogic on Friday March 27, 2015 @04:56PM (#9278947)
I used Truecaller and it's global spam block list had only a few hundred numbers on it.

I haven't been able to actually get Google Voice to prescreen callers. I know that they state they can do this, but haven't been able to implement it on my verizon phone.

Re:Ask HN: Would you be interested in a Spam-call Blocker fo... by smt88 on Friday March 27, 2015 @04:58PM (#9278956)
You have to go into the web version of Voice and then into your Settings. You can't set it up from a phone, as far as I know.
Re:Ask HN: Would you be interested in a Spam-call Blocker fo... by kidlogic on Friday March 27, 2015 @05:59PM (#9279301)
I've tried enabling it from the web interface and, even though it's selected and my number is properly configured, it still wont work :(