All of these apps are completely pointless. When a telemarketer calls and is redirected to voicemail that only confirms the validity of the phone number. And because of that the phone number will be passed on to other telemarketer lists. Having a "call blocker" that uses this "forward to voicemail" scheme is not only useless, but totally counterproductive to the real intention behind call blocking.
Much telemarketing and collection activity is initiated through robo-calling. You can preface your voice mail with the three-tone "no such number" sound. It's available on the internet. Many robo-call bots recognize these tones and will automatically remove your number. Actual people will probably listen long enough to hear your voice, so it won't stop your contacts who legitimately reach your voice mail. Unfortunately, it also won't stop most telemarketers, collectors, etc. who are calling manually.
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